View Filing Data

Print Document View Excel Document

Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2012	Feb. 02, 2013	Jun. 29, 2012
Entity Information [Line Items]
Entity Registrant Name	NATURAL GAS SERVICES GROUP INC
Entity Central Index Key	0001084991
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		12,331,499
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 182,530,515

Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 28,086	$ 16,390
Trade accounts receivable, net of allowance for doubtful accounts of $437 and $296, respectively	6,691	5,679
Inventory, net of allowance for obsolescence of $211 and $486, respectively	26,509	26,965
Prepaid income taxes	275	109
Prepaid expenses and other	475	360
Total current assets	62,036	49,503
Rental equipment, net of accumulated depreciation of $70,266 and $56,623, respectively	151,015	142,473
Property and equipment, net of accumulated depreciation of $8,441 and $7,785 respectively	7,475	7,839
Goodwill, net of accumulated amortization of $325, both periods	10,039	10,039
Intangibles, net of accumulated amortization of $2,060 and $1,936, respectively	2,157	2,282
Other assets	29	28
Total assets	232,751	212,164
Current Liabilities:
Accounts payable	3,420	3,730
Accrued liabilities	5,817	3,644
Current income tax liability	522	75
Deferred income	2,027	4,863
Total current liabilities	11,786	12,312
Line of credit, non-current portion	897	1,017
Deferred income tax liability	43,741	36,769
Other long-term liabilities	502	524
Total liabilities	56,926	50,622
Commitments and contingencies (Note 9)
Stockholders’ Equity:
Preferred stock, 5,000 shares authorized, no shares issued or outstanding	0	0
Common stock, 30,000 shares authorized, par value $0.01; 12,241 and 12,179 shares issued and outstanding, respectively	122	122
Additional paid-in capital	88,823	87,225
Retained earnings	86,880	74,195
Total stockholders' equity	175,825	161,542
Total liabilities and stockholders' equity	$ 232,751	$ 212,164

Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Current Assets:
Allowance for doubtful accounts	$ 437	$ 296
Allowance for inventory obsolescence	211	486
Assets, Noncurrent [Abstract]
Accumulated depreciation, rental equipment	70,266	56,623
Less accumulated depreciation	8,441	7,785
Accumulated amortization, goodwill	325	325
Accumulated amortization, intangibles	$ 2,060	$ 1,936
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	12,241,000	12,179,000
Common stock, shares outstanding	12,241,000	12,179,000

Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue:
Sales, net	$ 36,375	$ 15,419	$ 12,370
Rental income	56,477	48,619	40,670
Service and maintenance income	870	1,120	868
Total revenue	93,722	65,158	53,908
Operating costs and expenses:
Cost of sales, exclusive of depreciation stated separately below	25,816	9,194	8,010
Cost of rentals, exclusive of depreciation stated separately below	23,737	20,742	16,205
Cost of service and maintenance, exclusive of depreciation stated separately below	354	458	535
Selling, general, and administrative expense	7,893	5,910	5,867
Depreciation and amortization	15,707	13,994	11,927
Total operating costs and expenses	73,507	50,298	42,544
Operating income	20,215	14,860	11,364
Other income (expense):
Interest expense	(18)	(55)	(194)
Other income (expense)	14	824	130
Total other income (expense)	(4)	769	(64)
Income before provision for income taxes	20,211	15,629	11,300
Provision for income taxes:
Current	554	75	24
Deferred taxes	6,972	5,794	4,248
Provision for income taxes	7,526	5,869	4,272
Net income	$ 12,685	$ 9,760	$ 7,028
Earnings per common share:
Net income per share - Basic	$ 1.04	$ 0.80	$ 0.58
Net income per share - Diluted	$ 1.03	$ 0.80	$ 0.58
Weighted average shares outstanding:
Basic (in shares)	12,220	12,148	12,108
Diluted (in shares)	12,320	12,250	12,210

Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings
Preferred stock, shares outstanding, beginning of period at Dec. 31, 2009		0
Balance, beginning of period at Dec. 31, 2009	$ 142,098	$ 0	$ 121	$ 84,570	$ 57,407
Common stock, shares outstanding, beginning of period at Dec. 31, 2009			12,101,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options	407	$ 0	$ 1	406	0
Exercise of common stock options, shares		0	46,000
Compensation expense on issuance of common stock options	804	$ 0	$ 0	804	0
Issuance of restricted stock	0			0	0
Issuance of restricted stock, shares		0	1,000
Compensation expense on issuance of restricted common stock	254	$ 0	$ 0	254	0
Net income applicable to common shares	7,028				7,028
Preferred stock, shares outstanding, end of period at Dec. 31, 2010		0
Balance, end of period at Dec. 31, 2010	150,591	$ 0	$ 122	86,034	64,435
Common stock, shares outstanding, end of period at Dec. 31, 2010			12,148,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options	123	$ 0	$ 0	123	0
Exercise of common stock options, shares		0	18,000
Compensation expense on issuance of common stock options	461	$ 0	$ 0	461	0
Issuance of restricted stock	0	$ 0	$ 0	0	0
Issuance of restricted stock, shares		0	13,000
Compensation expense on issuance of restricted common stock	607	$ 0	$ 0	607	0
Net income applicable to common shares	$ 9,760				9,760
Preferred stock, shares outstanding, end of period at Dec. 31, 2011	0	0
Balance, end of period at Dec. 31, 2011	$ 161,542	$ 0	$ 122	87,225	74,195
Common stock, shares outstanding, end of period at Dec. 31, 2011	12,179,000		12,179,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options	$ 180	$ 0	$ 0	180	0
Exercise of common stock options, shares		0	23,000
Compensation expense on issuance of common stock options	440	$ 0	$ 0	440	0
Issuance of restricted stock	0	$ 0	$ 0	0	0
Issuance of restricted stock, shares		0	39,000
Compensation expense on issuance of restricted common stock	978	$ 0	$ 0	978	0
Net income applicable to common shares	$ 12,685				12,685
Preferred stock, shares outstanding, end of period at Dec. 31, 2012	0	0
Balance, end of period at Dec. 31, 2012	$ 175,825	$ 0	$ 122	$ 88,823	$ 86,880
Common stock, shares outstanding, end of period at Dec. 31, 2012	12,241,000		12,241,000

Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
Statements of Cash Flows - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income applicable to common shares	$ 12,685	$ 9,760	$ 7,028
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,707	13,994	11,927
Deferred taxes	6,972	5,869	4,248
Stock based compensation	1,418	1,068	1,058
Gain on disposal of assets	0	(717)	(46)
Changes in current assets:
Trade accounts receivables	(1,012)	(400)	2,035
Inventory	456	(5,476)	2,773
Prepaid income taxes and prepaid expenses	(281)	1,964	(598)
Changes in current liabilities:
Accounts payable and accrued liabilities	1,863	1,859	1,791
Current income tax liability	447	1,229	(1,708)
Deferred income	(2,836)	4,474	299
Other	(1)	(1)	(9)
NET CASH PROVIDED BY OPERATING ACTIVITIES	35,418	33,623	28,798
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(23,766)	(36,525)	(21,908)
Proceeds from sale of property and equipment	5	1,019	47
NET CASH USED IN INVESTING ACTIVITIES	(23,761)	(35,506)	(21,861)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from line of credit	0	0	2,000
Proceeds from other long-term liabilities, net	(21)	(4)	(30)
Repayments of long-term debt	0	0	(6,194)
Repayments of line of credit	(120)	(983)	(7,000)
Proceeds from exercise of stock options	180	123	407
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	39	(864)	(10,817)
NET CHANGE IN CASH AND CASH EQUIVALENTS	11,696	(2,747)	(3,880)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	16,390	19,137	23,017
CASH AND CASH EQUIVALENTS AT END OF PERIOD	28,086	16,390	19,137
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid	18	61	238
Income taxes paid	267	130	2,204
NON-CASH TRANSACTIONS
Transfer of rental equipment to inventory	$ 8,690	$ 0	$ 225

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Organization and Principles of Consolidation

These notes apply to the financial statements of Natural Gas Services Group, Inc. (the "Company", “NGSG”, "Natural Gas Services Group", "we" or "our") (a Colorado corporation). Natural Gas Services Group, Inc. was formed on December 17, 1998 for the purposes of combining the operations of certain manufacturing, service and leasing entities.

Nature of Operations

Natural Gas Services Group, Inc. is a leading provider of small to medium horsepower compression equipment to the natural gas industry. We focus primarily on the non-conventional natural gas production business in the United States (such as coal bed methane, gas shale and tight gas). We manufacture, fabricate and rent natural gas compressors that enhance the production of natural gas wells. NGSG provides maintenance services for its natural gas compressors. In addition, we sell custom fabricated natural gas compressors to meet customer specifications dictated by well pressures, production characteristics and particular applications. We also manufacture and sell flare systems for oil and natural gas plant and production facilities.

Use of Estimates

The preparation of our financial statements in conformity with accounting principles generally accepted in the United States of America requires our management to make estimates and assumptions that affect the amounts reported in these financial statements and accompanying notes. Actual results could differ from those estimates. Significant estimates include fixed asset lives, bad debt allowance and the allowance for inventory obsolescence. It is at least reasonably possible these estimates could be revised in the near term and the revisions could be material.

Cash Equivalents

For purposes of reporting cash flows, we consider all short-term investments with an original maturity of three months or less to be cash equivalents.

Accounts Receivable

Our trade receivables consist of customer obligations for the sale of compressors and flare systems due under normal trade terms, and operating leases for the use of our natural gas compressors. The receivables are not collateralized except as provided for under lease agreements. However, we require deposits of as much as 50% for large custom contracts. We extend credit based on management's assessment of the customer's financial condition, receivable aging, customer disputes and general business and economic conditions. The allowance for doubtful accounts was $437,000 and $296,000 at December 31, 2012 and 2011, respectively, is adequate, however actual write-offs may exceed the recorded allowance.

Revenue Recognition

Revenue from the sales of custom and fabricated compressors, and flare systems is recognized when title passes to the customer, the customer assumes risks and rewards of ownership, collectability is reasonably assured and delivery occurs as directed by our customer. Exchange and rebuilt compressor revenue is recognized when both the replacement compressor has been delivered and the rebuild assessment has been completed. Revenue from compressor service and retrofitting services is recognized upon providing services to the customer. Maintenance agreement revenue is recognized as services are rendered. Rental revenue is recognized over the terms of the respective rental agreements. Deferred income represents payments received before a product is shipped. Revenue from the sale of rental units is included in sales revenue when equipment is shipped or title is transferred to the customer.

Major Customers and Concentration of Credit Risk

Sales and rental income to EOG Resources, Inc. ("EOG") and Devon Energy Production, Inc. ("Devon") in 2012 amounted to 32% and 12% of revenue, respectively. Sales and rental income to EOG and Devon in 2011 amounted to 17% and 16% of revenue, respectively. Sales and rental income Devon in 2010 amounted to 19% of revenue. No other single customer accounted for more than 10% of our revenues in 2012, 2011 or 2010. EOG amounted to 17% of our accounts receivable as of December 31, 2012. EOG, Devon, and Linn Operating amounted to 39% and 20% and 11%, respectively, of our accounts receivable as of December 31, 2011. No other customers amounted to more than 10% of our accounts receivable as of December 31, 2011 and 2012.

Inventory

Inventory is valued at the lower of cost or market. The cost of inventories is determined by the weighted average method. A reserve is recorded against inventory balances for estimated obsolescence. This reserve is based on specific identification and historical experience and totaled $211,000 and $486,000 at December 31, 2012 and 2011, respectively. There were no new completed compressor units at December 31, 2012 or at December 31, 2011 available for sale or for use in our rental fleet. At December 31, 2012 and 2011, respectively, inventory consisted of the following (in thousands):



	2012		2011
Raw materials	$	19,654	$	20,364
Finished goods	—		—
Work in process	6,855		6,601
	$	26,509	$	26,965

Property and Equipment

Property and equipment is recorded at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which range from three to forty years. Rental equipment has an estimated useful life of fifteen years.

Gains and losses resulting from sales and dispositions of property and equipment are included in current operations. Maintenance and repairs are charged to operations as incurred.

Goodwill

Goodwill represents the cost in excess of fair value of the identifiable net assets acquired in three acquisitions. Goodwill is tested for impairment annually or whenever events indicate impairment may have occurred. The annual goodwill impairment test is performed in the fourth quarter of each year.

Intangibles

At December 31, 2012, NGSG had intangible assets with a gross carrying value of $4.2 million, which relate to developed technology, acquired customer contracts, distribution agreements and non-compete agreements. The carrying amount net of accumulated amortization at December 31, 2012 and 2011 was $2.2 million and $2.3 million respectively. Intangible assets are amortized on a straight-line basis with useful lives ranging from 5 to 20 years, with a weighted average remaining life of approximately eleven years as of December 31, 2012. Amortization expense recognized in each of the years ending December 31, 2012, 2011, and 2010 was $125,000, $179,000 and $260,000 respectively. NGSG has an intangible asset with a gross carrying value of $654,000 at December 31, 2012 related to the trade name of SCS which was acquired in our acquisition of Screw Compression Systems in January 2005. This asset is not being amortized as it has been deemed to have an indefinite life.

The following table represents estimated future amortization expense for the years ending December 31, (in thousands).



2013	$	125
2014	125
2015	125
2016	125
2017	125
Thereafter	878
	$	1,503

Our policy is to periodically review intangibles for impairment through an assessment of the estimated future cash flows related to such assets. In the event that assets are found to be carried at amounts in excess of estimated undiscounted future cash flows, then the assets will be adjusted for impairment to a level commensurate with a discounted cash flow analysis of the underlying assets. Based upon our most recent analysis, we believe no impairment of intangible assets exists as of December 31, 2012.

Warranty

We accrue amounts for estimated warranty claims based upon current and historical product warranty costs and any other related information known. The warranty reserve was $336,000 and $158,000 for December 31, 2012 and 2011, respectively, and is included in accrued liabilities on the balance sheet.

Financial Instruments and Concentrations of Credit Risk

We invest our cash primarily in deposits and money market funds with commercial banks. At times, cash balances at banks and financial institutions may exceed federally insured amounts.

Per Share Data

Basic earnings per common share is computed using the weighted average number of common shares outstanding during the period. Diluted earnings per common share is computed using the weighted average number of common stock and common stock equivalent shares outstanding during the period. There were no an anti-dilutive securities in 2012, 2011, and 2010.

The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share amounts):



	Year Ended December 31,
	2012		2011		2010
Numerator:
Net income	$	12,685	$	9,760	$	7,028
Denominator for basic net income per common share:
Weighted average common shares outstanding	12,220		12,148		12,108
Denominator for diluted net income per share:
Weighted average common shares outstanding	12,220		12,148		12,108
Dilutive effect of stock options and restricted shares	100		102		102
Diluted weighted average shares	12,320		12,250		12,210
Earnings per common share:
Basic	$	1.04	$	0.80	$	0.58
Diluted	$	1.03	$	0.80	$	0.58

Income Taxes

Deferred tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of assets and liabilities and their respective tax bases, and operating losses and tax credit carry-forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled.

ASC Topic 740 prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. In order to record any financial statement benefit, we are required to determine, based on technical merits of the position, whether it is more likely than not (a likelihood of more than 50 percent) that a tax position will be sustained upon examination, including resolution of any related appeals or litigation processes. If that step is satisfied, then we must measure the tax position to determine the amount of benefit to recognize in the financial statements. The tax position is measured at the largest amount of the benefit that is greater than 50 percent likely of being realized upon ultimate settlement. We have no uncertain tax positions as of December 31, 2012 or 2011.

Fair Value Measurement

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date under current market conditions. Topic 820 established a fair value hierarchy, which requires an entity to maximize the use of observable inputs when measuring fair value. These inputs are categorized as follows:

Level 1- quoted prices in an active market for identical assets or liabilities;

Level 2- quoted prices in an active market for similar assets or liabilities, inputs other than quoted prices that are observable for similar assets or liabilities, inputs derived principally from or corroborated by observable market data by correlation or other means; and

Level 3- valuation methodology with unobservable inputs that are significant to the fair value measurement.

The Company categorizes $0.9 million and $1.0 million of debt at December 31, 2012 and 2011, respectively as Level 2 measurements. Management believes that the fair value of our cash and cash equivalents, trade receivables, accounts payable and line of credit at December 31, 2012 and 2011 approximate their carrying values due to the short-term nature of the instruments or the use of prevailing market interest rates.

Segments and Related Information

ASC 280-10-50, “Operating Segments”, define the characteristics of an operating segment as a) being engaged in business activity from which it may earn revenue and incur expenses, b) being reviewed by the company's chief operating decision maker (CODM) for decisions about resources to be allocated and assess its performance and c) having discrete financial information. Although we indeed look at our product to analyze the nature of our revenue, other financial information, such as certain costs and expenses, net income and EBITDA are not captured or analyzed by these categories. Therefore discrete financial information is not available by product line and our CODM does not make resource allocation decisions or assess the performance of the business based on these categories, but rather in the aggregate. Based on this, Management believes that it operates in one business segment.

In their analysis of product lines as potential operating segments, management also considered ASC 280-10-50-11, “Aggregation Criteria”, which allows for the aggregation of operating segments if the segments have similar economic characteristics and if the segments are similar in each of the following areas:


•	The nature of the products and services;


•	The nature of the production processes;


•	The type or class of customer for their products and services;


•	The methods used to distribute their products or provide their services; and


•	The nature of the regulatory environment, if applicable.

We are engaged in the business of designing and manufacturing compressors and flares. Our compressors and flares are sold and rented to our customers. In addition, we provide service and maintenance on compressors in our fleet and to third parties.These business activities are similar in all geographic areas. Our manufacturing process is essentially the same for the entire Company and is performed in house at our facilities in Midland, Texas and Tulsa, Oklahoma. Our customers primarily consist of entities in the business of producing natural gas. The maintenance and service of our products is consistent across the entire Company and is performed via an internal fleet of vehicles. The regulatory environment is similar in every jurisdiction in that the most impacting regulations and practices are the result of federal energy policy. In addition, the economic characteristics of each customer arrangement are similar in that we maintain policies at the corporate level.

Recently Issued Accounting Pronouncements

In September 2011, FASB issued ASU 2011-08, Intangibles-Goodwill and Other. Under this Update, an entity has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. However, if an entity concludes otherwise, then it is required to perform the first step of the two-step impairment test by calculating the fair value of the reporting unit and comparing the fair value with the carrying amount of the reporting unit. If the carrying amount of a reporting unit exceeds its fair value, then the entity is required to perform the second step of the goodwill impairment test to measure the amount of the impairment loss, if any. Under the amendments in this Update, an entity has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test. An entity may resume performing the qualitative assessment in any subsequent period. The amendments are effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. Early adoption is permitted, for fiscal year beginning prior to December 15, 2011. We assessed goodwill for 2012 by applying the qualitative review as outlined in this guidance and no impairment was recorded.

Rental Activity

12 Months Ended

Dec. 31, 2012

Leases [Abstract]

Rental Activity

We rent natural gas compressor packages to entities in the petroleum industry. These rental arrangements are classified as operating leases and generally have original terms of 6 months to 2 years and continue on a month-to-month basis thereafter. Future minimum rent payments for arrangements not on a month-to-month basis at December 31, 2012 are as follows :



Years Ending December 31, (in thousands)
2013	$	8,630
2014	174
Thereafter	—
Total	$	8,804

- Definition

The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

+ References + Details

Property and Equipment

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and equipment consists of the following at December 31, 2012 and 2011 (in thousands):



	Useful Lives (Years)	2012			2011
Land and building	30	$	5,606		$	5,459
Leasehold improvements	39	758			758
Office equipment and furniture	5	1,396			1,321
Software	5	573			551
Machinery and equipment	7	2,433			2,337
Vehicles	3	5,150			5,198
Less accumulated depreciation		(8,441		)	(7,785		)
Total		$	7,475		$	7,839

Depreciation expense for property and equipment and the compressors described in Note 2 was $15.6 million, $13.8 million and $11.7 million for the years ended December 31, 2012, 2011 and 2010, respectively.

- Definition

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

+ References + Details

Credit Facility	12 Months Ended
Credit Facility	Dec. 31, 2012
Debt Disclosure [Abstract]
Credit Facility	Credit Facility On December 31, 2010, we established a $20 million senior secured revolving credit agreement (subject to a right, on an uncommitted basis, to increase the commitments thereunder to up to $40 million) with JP Morgan Chase Bank, N.A. On December 31, 2012, we amended and renewed the Credit Agreement, which was set to expire on December 31, 2012 (the "Amended Credit Agreement"). The Amended Credit Agreement increased our aggregate commitment amount from $20 million to $30 million, subject to collateral availability. We also have a right to request from the lender, on an uncommitted basis, an increase of up to $20 million on the aggregate commitment (which could potentially increase the commitment amount to $50 million). The maturity date was extended to December 31, 2014, and the interest rate terms were amended. Borrowing Base. At any time before the maturity of the Amended Credit Agreement, we may draw, repay and re-borrow amounts available under the borrowing base up to the maximum aggregate availability discussed above. Generally, the borrowing base equals the sum of (a) 80% of our eligible accounts receivable plus (b) 50% of the book value of our eligible general inventory (not to exceed 50% of the commitment amount at the time) plus (c) 75% of the book value of our eligible equipment inventory. JPMorgan Chase Bank (the “Lender”) may adjust the borrowing base components if material deviations in the collateral are discovered in future audits of the collateral. We had $29.0 million borrowing base availability at December 31, 2012 under the terms of our Amended Credit Agreement. Interest and Fees. Under the terms of the Amended Credit Agreement, we have the option of selecting the applicable variable rate for each revolving loan, or portion thereof, of either (a) LIBOR multiplied by the Statutory Reserve Rate (as defined in the Amended Credit Agreement), with respect to this rate, for Eurocurrency funding, plus the Applicable Margin (“LIBOR-based”), or (b) CB Floating Rate, which is the Lender's Prime Rate less the Applicable Margin; provided, however, that no more than three LIBOR-based borrowings under the agreement may be outstanding at any one time. For purposes of the LIBOR-based interest rate, the Applicable Margin is 1.50%. For purposes of the CB Floating Rate, the Applicable Margin is 1.25%. Accrued interest is payable monthly on outstanding principal amounts, provided that accrued interest on LIBOR-based loans is payable at the end of each interest period, but in no event less frequently than quarterly. In addition, fees and expenses are payable in connection with our requests for letters of credit (generally equal to the Applicable Margin for LIBOR-related borrowings multiplied by the face amount of the requested letter of credit) and administrative and legal costs. Maturity . The maturity date of the Amended Credit Agreement is December 31, 2014, at which time all amounts borrowed under the agreement will be due and outstanding letters of credit must be cash collateralized. The agreement may be terminated early upon our request or the occurrence of an event of default. Security. The obligations under the Amended Credit Agreement are secured by a first priority lien on all of our inventory and accounts and leases receivables, along with a first priority lien on a variable number of our leased compressor equipment the book value of must be maintained at a minimum of 2.00 to 1.00 commitment coverage ratio (such ratio being equal to (i) the amount of the borrowing base as of such date to (ii) the amount of the commitment as of such date.) Covenants. The Amended Credit Agreement contains customary representations and warranties, as well as covenants which, among other things, limit our ability to incur additional indebtedness and liens; enter into transactions with affiliates; make acquisitions in excess of certain amounts; pay dividends; redeem or repurchase capital stock or senior notes; make investments or loans; make negative pledges; consolidate, merge or effect asset sales; or change the nature of our business. In addition, we also have certain financial covenants that require us to maintain on a consolidated basis a leverage ratio less than or equal to 2.50 to 1.00 as of the last day of each fiscal quarter. Events of Default and Acceleration. The Amended Credit Agreement contains customary events of default for credit facilities of this size and type, and includes, without limitation, payment defaults; defaults in performance of covenants or other agreements contained in the loan documents; inaccuracies in representations and warranties; certain defaults, termination events or similar events; certain defaults with respect to any other Company indebtedness in excess of $50,000; certain bankruptcy or insolvency events; the rendering of certain judgments in excess of $150,000; certain ERISA events; certain change in control events and the defectiveness of any liens under the secured revolving credit facility. Obligations under the Amended Credit Agreement may be accelerated upon the occurrence of an event of default. As of December 31, 2012, we were in compliance with all covenants in our Amended Credit Agreement. A default under our Credit Agreement could trigger the acceleration of our bank debt so that it is immediately due and payable. Such default would likely limit our ability to access other credit. At December 31, 2012 our balance on the line of credit was $897,000.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Other Long-term Liabilities	12 Months Ended
Other Long-term Liabilities	Dec. 31, 2012
Other Liabilities Disclosure [Abstract]
Other Long-term Liabilities	Other Long-term Liabilities As of December 31, 2012 and 2011, we had a long-term liability of $275,000 to Midland Development Corporation. This amount is to be recognized as income contingent upon certain staffing requirements in the future. In addition, we entered into a purchase agreement with a vendor on July 30, 2008 pursuant to which we agreed to purchase up to $4.8 million of our paint and coating requirements exclusively from the vendor. In connection with the execution of the agreement, the vendor paid us a $300,000 fee which is considered to be a discount toward future purchases from the vendor. The $300,000 payment we received is recorded as a long-term liability and will decrease as the purchase commitment is fulfilled. The long-term liability remaining for the purchase commitment was $227,000 and $253,000 as of December 31, 2012 and 2011, respectively.

Income Taxes

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Income Taxes

The provision for income taxes consists of the following (in thousands):



	2012		2011		2010
Current provision:
Federal	$	332	$	—	$	—
State	222		75		24
	554		75		24
Deferred provision:
Federal	6,972		5,166		4,009
State	—		628		239
	6,972		5,794		4,248
	$	7,526	$	5,869	$	4,272

The income tax effects of temporary differences that give rise to significant portions of deferred income tax assets and (liabilities) are as follows (in thousands):



	2012			2011
Deferred income tax assets:
Net operating loss carryover	$	1,117		$	6,828
Other	1,459			1,218
Total deferred income tax assets	$	2,576		$	8,046
Deferred income tax liabilities:
Property and equipment	(45,242		)	(43,716		)
Goodwill and other intangible assets	(1,075		)	(1,099		)
Other	—			—
Total deferred income tax liabilities	(46,317		)	(44,815		)
Net deferred income tax liabilities	$	(43,741	)	$	(36,769	)

The effective tax rate differs from the statutory rate as follows:



	2012		2011		2010
Statutory rate	34	%	34	%	34	%
State and local taxes	1	%	3	%	2	%
Other	2	%	1	%	2	%
Effective rate	37	%	38	%	38	%

Our policy regarding income tax interest and penalties is to expense those items as general and administrative expense. During the years ended December 31, 2012, 2011 and 2010, there were no significant income tax interest or penalty items in the income statement.

We had a regular income tax net operating loss carry forward of $3.2 million for federal income taxes as of December 31, 2012. This net operating loss will begin to expire in 2031. We file income tax returns in the U.S. federal jurisdiction and various state jurisdictions. With few exceptions, we are no longer subject to U.S. federal or state income tax examination by tax authorities for years before 2007. During the year ended December 31, 2012, we utilized $16.8 million of gross federal net operating loss carryforwards which reduced our current income tax expense by approximately $5.7 million

We are subject to extensive tax laws and regulations, including federal, state and local income taxes. As new tax laws and regulations are enacted and changes are made to existing tax laws and regulations we may be subject to increased future tax expenditures. Our tax positions and the resulting liabilities are subject to audits by the respective taxing authority. These audits may result in additional taxes as well as interest and penalties. We are not aware of any tax positions for which the outcome is uncertain or which is subject to a current review by any tax authority associated with our filings. We have also not established a reserve for any potential obligation related to uncertain tax position.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

+ Details

Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 31, 2012
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	Stockholders' Equity Preferred Stock We have a total of 5.0 million authorized preferred shares with rights and preferences as designated by the Board of Directors. As of December 31, 2012 and 2011, there were no issued or outstanding preferred shares. Securities offering On August 14, 2009 (as amended on February 15, 2013) we filed a universal shelf registration statement on Form S-3 with the Securities and Exchange Commission ("SEC") to register up to $150,000,000 of securities, including debt securities, common stock, preferred stock, depository shares, rights to purchase common stock and warrants to purchase any of the foregoing securities. The SEC has declared the statement effective, and we may issue any of the registered securities from time to time in one or more offerings depending on market conditions and our financing needs. Restricted Securities On June 16, 2009, at our annual meeting of shareholders, our shareholders adopted the 2009 Restricted Stock/Unit Plan. A total of 300,000 shares of Company common stock are reserved for issuance under the restricted stock plan. During January 2012, we awarded 70,000 restricted shares of stock under the 2009 Restricted Stock Plan. Of these restricted shares, 50,000 vest over a one-year period and the remainder vest over a three-year period, beginning on the date of grant. Compensation expense related to the restricted shares was approximately $978,000, for the year ended December 31, 2012. As of December 31, 2012, there was a total of approximately $457,000 of unrecognized compensation expense related to the nonvested portion of these restricted shares. This expense is expected to be recognized over the next two years .

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section B
-Paragraph 7, 11A
-Chapter 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
-Article 4

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Stock-Based Compensation

12 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock Option Plan

Our 1998 Stock Option Plan (the "Plan"), which is stockholder approved, permits the grant of stock options to its employees for up to 550,000 shares of common stock. On June 16, 2009, at our annual meeting of shareholders, our shareholders approved a proposed amendment to the Plan to add additional 200,000 shares of common stock to the Plan, thereby authorizing the issuance of up to 750,000 shares of common stock under the Plan. We believe that such awards better align the interests of our employees with our stockholders. Option awards are generally granted with an exercise price equal to the market price of our stock at the date of grant; those option awards generally vest based on three years of continuous service and have ten-year contractual terms. Certain option and share awards provide for accelerated vesting if there is a change in control of the Company (as defined in the Plan). The last date that grants can be made under the Plan is March 1, 2016. As of December 31, 2012, 280,503 shares were still available for issue under the Plan.

The fair value of each option award is estimated on the date of grant using the Black-Scholes option valuation model that uses the assumptions noted in the following table. The risk-free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. The expected life of options granted is based on the vesting period and historical exercise and post-vesting employment termination behavior for similar grants. We use historical data to estimate option exercise and employee termination within the valuation model; separate groups of employees that have similar historical exercise behavior are considered separately for valuation purposes.



Weighted average Black -Scholes fair value assumption	2012		2011		2010
Risk free rate	0.98	%	2.09	%	1.22	%
Expected life	6 years		5 years		2 years
Expected volatility	62.37	%	64.89	%	64.32	%
Expected dividend yield	—		—		—

A summary of all option activity as of December 31, 2012 and changes during the year then ended is presented below.



	Number of Stock Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2011	422,239		$	15.06	6.48	$	766
Granted	20,000		14.89
Exercised	(22,500	)	7.47			151
Canceled/Forfeited	(17,917	)	18.40
Expired	(7,500	)	16.82
Outstanding, December 31, 2012	394,322		$	15.30	5.79	$	910
Exercisable, December 31, 2012	344,988		$	15.06	5.44	$	878

We granted an option to purchase 20,000 shares to non-executive employees on January 25, 2012 at an exercise price of $14.89 with a three year vesting period.

The weighted average grant date fair value of options granted during the years 2012, 2011, and 2010 was $8.22, $10.00, and $7.30 respectively. The total intrinsic value, or the difference between the exercise price and the market price on the date of exercise, of options exercised during the years ended December 31, 2012, 2011,and 2010 was approximately $151,000, $127,000, and $400,000 respectively. Cash received from stock options exercised during the years ended December 31, 2012, 2011, and 2010 was $180,000, $123,000, and $407,000, respectively.

The following table summarizes information about our stock options outstanding at December 31, 2012:



Range of Exercise Prices	Options Outstanding				Options Exercisable
Range of Exercise Prices	Shares	Weighted Average Remaining Contractual Life (years)	Weighted Average Exercise Price		Shares	Weighted Average Exercise Price
$5.59-9.43	79,239	3.96	$	8.61	79,239	$	8.61
$9.44-15.60	81,500	6.02	12.89		61,500	12.22
$15.61-20.48	233,583	6.34	18.42		204,249	18.42
$0.00-20.48	394,322	5.79	$	15.30	344,988	$	15.06

The summary of the status of our unvested stock options as of December 31, 2012 and changes during the year then ended is presented below.



Unvested stock options:	Shares		Weighted Average Grant Date Fair Value
Unvested at December 31, 2011	78,666		$	8.82
Granted	20,000		$	8.22
Vested	(47,082	)	$	8.36
Cancelled/Forfeited	(2,250	)	$	8.98
Unvested at December 31, 2012	49,334		$	9.01

We recognized stock compensation expense from stock options vesting of $440,000, $461,000, and $804,000 respectively, for the years ended December 31, 2012, 2011 and 2010. The total income tax benefit recognized in the income statement for stock based compensation was $264,000, $148,000 and $137,000, respectively, for the years ended December 31, 2012, 2011 and 2010. As of December 31, 2012, there was approximately $200,000 of total unamortized compensation cost related to unvested stock options. We expect to recognize such cost over a weighted-average period of 1.6 years. There was no income tax benefit realized for the tax deductions from stock options exercised for the years ending 2012, 2011 and 2010 due to utilization of net operating loss carryforwards.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Commitments and Contingencies

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

401(k) Plan

We offer a 401(k) Plan to all employees that have reached the age of eighteen and have completed six months of service. The participants may contribute up to 100% of their salary subject to IRS limitations. Employer contributions are subject to Board discretion and are subject to a vesting schedule of 20% each year after the first year and 100% after six years. We contributed $282,710, $410,000, and $185,000 to the 401(k) Plan in 2012, 2011 and 2010, respectively.

Rented Facilities

We lease certain of our facilities under operating leases with terms generally ranging from month-to-month to five years. Most facility leases contain renewal options. Remaining future minimum rental payments due under these leases for the years ended December 31 are as follows (in thousands):



2013	$	205
2014	56
2015	41
2016	30
Thereafter	23
Total	$	355

Rent expense under such leases was $453,000, $450,000, and $526,000 for the years ended December 31, 2012, 2011 and 2010, respectively.

Legal Proceedings

From time to time, we are a party to various legal proceedings in the ordinary course of our business. While management is unable to predict the ultimate outcome of these actions, it believes that any ultimate liability arising from these actions will not have a material effect on our financial position, results of operations or cash flow. We are not currently a party to any bankruptcy, receivership, reorganization, adjustment or similar proceeding, and we are not aware of any other threatened litigation.

Segment Information

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Segment Information

Our management does not capture full financial information or utilize operating segments to make decisions about the business. As discussed in Note 1, management believes that it operates in one business segment. However, our management does rely on the before tax components in the tables below as major categories useful in managing the business. All sales and assets are currently located in continental United Sates.

For the Year Ended December 31, 2012



	Sales		Rental		Service & Maintenance		Corporate			Total
	(in thousands of dollars)
Revenue	$	36,375	$	56,477	$	870	$	—		$	93,722
Operating costs and expenses	25,816		23,737		354		23,600			73,507
Other income/(expense)	—		—		—		(4		)	(4		)
Income (loss) before provision for income taxes	$	10,559	$	32,740	$	516	$	(23,604	)	$	20,211

For the Year Ended December 31, 2011



	Sales		Rental		Service & Maintenance		Corporate			Total
	(in thousands of dollars)
Revenue	$	15,419	$	48,619	$	1,120	$	—		$	65,158
Operating costs and expenses	9,194		20,742		458		19,904			50,298
Other income/(expense)	—		—		—		769			769
Income (loss) before provision for income taxes	$	6,225	$	27,877	$	662	$	(19,135	)	$	15,629

For the Year Ended December 31, 2010



	Sales		Rental		Service & Maintenance		Corporate			Total
	(in thousands of dollars)
Revenue	$	12,370	40,670		868		$	—		$	53,908
Operating costs and expenses	8,010		16,205		535		17,794			42,544
Other income/(expense)	—		—		—		(64		)	(64		)
Income (loss) before provision for income taxes	$	4,360	$	24,465	$	333	$	(17,858	)	$	11,300

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Quarterly Financial Data – Unaudited

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data [Abstract]

Quarterly Financial Data – Unaudited

Quarterly Financial Data (in thousands, except per share data) – Unaudited



2012	Q1		Q2		Q3		Q4		Total
Total revenue	$	26,376	$	24,508	$	19,290	$	23,548	$	93,722
Operating income	5,622		4,829		4,241		5,523		20,215
Net income applicable to common shares	3,508		3,000		2,606		3,571		12,685
Net income per share - Basic	0.29		0.25		0.21		0.29		1.04
Net income per share - Diluted	0.29		0.24		0.21		0.29		1.03



2011	Q1		Q2		Q3		Q4		Total
Total revenue	$	15,054	$	13,758	$	17,701	$	18,645	$	65,158
Operating income	3,329		3,222		3,643		4,666		14,860
Net income applicable to common shares	2,497		2,008		2,231		3,024		9,760
Net income per share - Basic	0.21		0.16		0.18		0.25		0.80
Net income per share - Diluted	0.20		0.16		0.18		0.25		0.80

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References + Details

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Use of Estimates

Cash Equivalents

For purposes of reporting cash flows, we consider all short-term investments with an original maturity of three months or less to be cash equivalents.

Accounts Receivable

Revenue Recognition

Inventory

Property and Equipment

Gains and losses resulting from sales and dispositions of property and equipment are included in current operations. Maintenance and repairs are charged to operations as incurred.

Goodwill

Intangibles

Warranty

We accrue amounts for estimated warranty claims based upon current and historical product warranty costs and any other related information known.

Financial Instruments and Concentrations of Credit Risk

We invest our cash primarily in deposits and money market funds with commercial banks. At times, cash balances at banks and financial institutions may exceed federally insured amounts.

Per Share Data

Income Taxes

Fair Value Measurement

Level 1- quoted prices in an active market for identical assets or liabilities;

Level 3- valuation methodology with unobservable inputs that are significant to the fair value measurement.

Segments and Related Information


•	The nature of the products and services;


•	The nature of the production processes;


•	The type or class of customer for their products and services;


•	The methods used to distribute their products or provide their services; and


•	The nature of the regulatory environment, if applicable.

Recently Issued Accounting Pronouncements

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Schedule of Inventory

At December 31, 2012 and 2011, respectively, inventory consisted of the following (in thousands):



	2012		2011
Raw materials	$	19,654	$	20,364
Finished goods	—		—
Work in process	6,855		6,601
	$	26,509	$	26,965

Schedule of Estimated Future Amortization Expense

The following table represents estimated future amortization expense for the years ending December 31, (in thousands).



2013	$	125
2014	125
2015	125
2016	125
2017	125
Thereafter	878
	$	1,503

Computation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share amounts):



	Year Ended December 31,
	2012		2011		2010
Numerator:
Net income	$	12,685	$	9,760	$	7,028
Denominator for basic net income per common share:
Weighted average common shares outstanding	12,220		12,148		12,108
Denominator for diluted net income per share:
Weighted average common shares outstanding	12,220		12,148		12,108
Dilutive effect of stock options and restricted shares	100		102		102
Diluted weighted average shares	12,320		12,250		12,210
Earnings per common share:
Basic	$	1.04	$	0.80	$	0.58
Diluted	$	1.03	$	0.80	$	0.58

Rental Activity (Tables)

12 Months Ended

Dec. 31, 2012

Leases [Abstract]

Future Minimum Rent Payments for Operating Leases

Future minimum rent payments for arrangements not on a month-to-month basis at December 31, 2012 are as follows :



Years Ending December 31, (in thousands)
2013	$	8,630
2014	174
Thereafter	—
Total	$	8,804

Remaining future minimum rental payments due under these leases for the years ended December 31 are as follows (in thousands):



2013	$	205
2014	56
2015	41
2016	30
Thereafter	23
Total	$	355

Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and equipment consists of the following at December 31, 2012 and 2011 (in thousands):



	Useful Lives (Years)	2012			2011
Land and building	30	$	5,606		$	5,459
Leasehold improvements	39	758			758
Office equipment and furniture	5	1,396			1,321
Software	5	573			551
Machinery and equipment	7	2,433			2,337
Vehicles	3	5,150			5,198
Less accumulated depreciation		(8,441		)	(7,785		)
Total		$	7,475		$	7,839

Income Taxes Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Provision for Income Taxes

The provision for income taxes consists of the following (in thousands):



	2012		2011		2010
Current provision:
Federal	$	332	$	—	$	—
State	222		75		24
	554		75		24
Deferred provision:
Federal	6,972		5,166		4,009
State	—		628		239
	6,972		5,794		4,248
	$	7,526	$	5,869	$	4,272

Deferred Tax Assets and Liabilities

The income tax effects of temporary differences that give rise to significant portions of deferred income tax assets and (liabilities) are as follows (in thousands):



	2012			2011
Deferred income tax assets:
Net operating loss carryover	$	1,117		$	6,828
Other	1,459			1,218
Total deferred income tax assets	$	2,576		$	8,046
Deferred income tax liabilities:
Property and equipment	(45,242		)	(43,716		)
Goodwill and other intangible assets	(1,075		)	(1,099		)
Other	—			—
Total deferred income tax liabilities	(46,317		)	(44,815		)
Net deferred income tax liabilities	$	(43,741	)	$	(36,769	)

Effective Income Tax Rate Reconciliation

he effective tax rate differs from the statutory rate as follows:



	2012		2011		2010
Statutory rate	34	%	34	%	34	%
State and local taxes	1	%	3	%	2	%
Other	2	%	1	%	2	%
Effective rate	37	%	38	%	38	%

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Options, Valuation Assumptions



Weighted average Black -Scholes fair value assumption	2012		2011		2010
Risk free rate	0.98	%	2.09	%	1.22	%
Expected life	6 years		5 years		2 years
Expected volatility	62.37	%	64.89	%	64.32	%
Expected dividend yield	—		—		—

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of all option activity as of December 31, 2012 and changes during the year then ended is presented below.



	Number of Stock Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2011	422,239		$	15.06	6.48	$	766
Granted	20,000		14.89
Exercised	(22,500	)	7.47			151
Canceled/Forfeited	(17,917	)	18.40
Expired	(7,500	)	16.82
Outstanding, December 31, 2012	394,322		$	15.30	5.79	$	910
Exercisable, December 31, 2012	344,988		$	15.06	5.44	$	878

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

e following table summarizes information about our stock options outstanding at December 31, 2012:



Range of Exercise Prices	Options Outstanding				Options Exercisable
Range of Exercise Prices	Shares	Weighted Average Remaining Contractual Life (years)	Weighted Average Exercise Price		Shares	Weighted Average Exercise Price
$5.59-9.43	79,239	3.96	$	8.61	79,239	$	8.61
$9.44-15.60	81,500	6.02	12.89		61,500	12.22
$15.61-20.48	233,583	6.34	18.42		204,249	18.42
$0.00-20.48	394,322	5.79	$	15.30	344,988	$	15.06

Schedule of Stock Options Roll Forward [Table Text Block]

he summary of the status of our unvested stock options as of December 31, 2012 and changes during the year then ended is presented below.



Unvested stock options:	Shares		Weighted Average Grant Date Fair Value
Unvested at December 31, 2011	78,666		$	8.82
Granted	20,000		$	8.22
Vested	(47,082	)	$	8.36
Cancelled/Forfeited	(2,250	)	$	8.98
Unvested at December 31, 2012	49,334		$	9.01

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Rent Payments for Operating Leases

Future minimum rent payments for arrangements not on a month-to-month basis at December 31, 2012 are as follows :



Years Ending December 31, (in thousands)
2013	$	8,630
2014	174
Thereafter	—
Total	$	8,804

Remaining future minimum rental payments due under these leases for the years ended December 31 are as follows (in thousands):



2013	$	205
2014	56
2015	41
2016	30
Thereafter	23
Total	$	355

Segment Information (Tables)

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Segment Reporting Information

All sales and assets are currently located in continental United Sates.

For the Year Ended December 31, 2012



	Sales		Rental		Service & Maintenance		Corporate			Total
	(in thousands of dollars)
Revenue	$	36,375	$	56,477	$	870	$	—		$	93,722
Operating costs and expenses	25,816		23,737		354		23,600			73,507
Other income/(expense)	—		—		—		(4		)	(4		)
Income (loss) before provision for income taxes	$	10,559	$	32,740	$	516	$	(23,604	)	$	20,211

For the Year Ended December 31, 2011



	Sales		Rental		Service & Maintenance		Corporate			Total
	(in thousands of dollars)
Revenue	$	15,419	$	48,619	$	1,120	$	—		$	65,158
Operating costs and expenses	9,194		20,742		458		19,904			50,298
Other income/(expense)	—		—		—		769			769
Income (loss) before provision for income taxes	$	6,225	$	27,877	$	662	$	(19,135	)	$	15,629

For the Year Ended December 31, 2010



	Sales		Rental		Service & Maintenance		Corporate			Total
	(in thousands of dollars)
Revenue	$	12,370	40,670		868		$	—		$	53,908
Operating costs and expenses	8,010		16,205		535		17,794			42,544
Other income/(expense)	—		—		—		(64		)	(64		)
Income (loss) before provision for income taxes	$	4,360	$	24,465	$	333	$	(17,858	)	$	11,300

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data [Abstract]

Quarterly Financial Data



2012	Q1		Q2		Q3		Q4		Total
Total revenue	$	26,376	$	24,508	$	19,290	$	23,548	$	93,722
Operating income	5,622		4,829		4,241		5,523		20,215
Net income applicable to common shares	3,508		3,000		2,606		3,571		12,685
Net income per share - Basic	0.29		0.25		0.21		0.29		1.04
Net income per share - Diluted	0.29		0.24		0.21		0.29		1.03



2011	Q1		Q2		Q3		Q4		Total
Total revenue	$	15,054	$	13,758	$	17,701	$	18,645	$	65,158
Operating income	3,329		3,222		3,643		4,666		14,860
Net income applicable to common shares	2,497		2,008		2,231		3,024		9,760
Net income per share - Basic	0.21		0.16		0.18		0.25		0.80
Net income per share - Diluted	0.20		0.16		0.18		0.25		0.80

Summary of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2012 USD ($) $ / shares	Sep. 30, 2012 USD ($) $ / shares	Jun. 30, 2012 USD ($) $ / shares	Mar. 31, 2012 USD ($) $ / shares	Dec. 31, 2011 USD ($) $ / shares	Sep. 30, 2011 USD ($) $ / shares	Jun. 30, 2011 USD ($) $ / shares	Mar. 31, 2011 USD ($) $ / shares	Dec. 31, 2012 USD ($) segment $ / shares shares	Dec. 31, 2011 USD ($) $ / shares shares	Dec. 31, 2010 USD ($) $ / shares shares
Accounting Policies [Abstract]
Cash equivalents, qualification, maximum original maturity of short-term investments									3 months
Allowance for inventory obsolescence	$ 211				$ 486				$ 211	$ 486
Raw materials	19,654				20,364				19,654	20,364
Finished goods	0				0				0	0
Work in process	6,855				6,601				6,855	6,601
Inventory, net	26,509				26,965				26,509	26,965
Product warranty reserves	336				158				336	158
Other income (expense)									$ 14	824	$ 130
Number of business segments \| segment									1
Numerator:
Net income applicable to common shares	$ 3,571	$ 2,606	$ 3,000	$ 3,508	$ 3,024	$ 2,231	$ 2,008	$ 2,497	$ 12,685	$ 9,760	$ 7,028
Denominator for basic net income per common share:
Weighted average common shares outstanding (in shares) \| shares									12,220	12,148	12,108
Denominator for diluted net income per share:
Dilutive effect of stock options and restricted shares (in shares) \| shares									100	102	102
Diluted weighted average common shares outstanding (in shares) \| shares									12,320	12,250	12,210
Earnings per common share:
Net income per share - Basic \| $ / shares	$ 0.29	$ 0.21	$ 0.25	$ 0.29	$ 0.25	$ 0.18	$ 0.16	$ 0.21	$ 1.04	$ 0.80	$ 0.58
Net income per share - Diluted \| $ / shares	$ 0.29	$ 0.21	$ 0.24	$ 0.29	$ 0.25	$ 0.18	$ 0.16	$ 0.20	$ 1.03	$ 0.80	$ 0.58

Summary of Significant Accounting Policies (Receivables) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ 437	$ 296
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer deposit requirements, large custom contracts, maximum percentage	50.00%

Summary of Significant Accounting Policies (Concentration Risk) (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
EOG \| Sales and Rental Income
Concentration Risk [Line Items]
Concentration risk, percentage	32.00%	17.00%
EOG \| Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	17.00%	39.00%
Devon \| Sales and Rental Income
Concentration Risk [Line Items]
Concentration risk, percentage	12.00%	16.00%	19.00%
Devon \| Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage		20.00%
Linn Operating \| Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage		11.00%

Summary of Significant Accounting Policies (Intangibles) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2012 USD ($) entity	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)
Intangible Assets [Line Items]
Number of businesses acquired with goodwill component \| entity	3
Intangible assets, gross carrying value	$ 4,200
Intangibles, net of accumulated amortization	2,157	$ 2,282
Estimated future amortization expense:
2013	125
2014	125
2015	125
2016	125
2017	125
Thereafter	878
Total future amortization	1,503
Trade Names
Intangible Assets [Line Items]
Indefinite-lived intangible asset, gross carrying value	654
Developed Technology, Acquired Customer Contracts, Distribution Agreements and Non-compete Agreements
Intangible Assets [Line Items]
Intangibles, net of accumulated amortization	$ 2,200	2,300
Intangible assets, weighted average remaining life	11 years
Amortization expense	$ 125	$ 179	$ 260
Developed Technology, Acquired Customer Contracts, Distribution Agreements and Non-compete Agreements \| Minimum
Intangible Assets [Line Items]
Intangible assets, useful lives	5 years
Developed Technology, Acquired Customer Contracts, Distribution Agreements and Non-compete Agreements \| Maximum
Intangible Assets [Line Items]
Intangible assets, useful lives	20 years

Summary of Significant Accounting Policies (Property and Equipment) (Details)	12 Months Ended
	Dec. 31, 2012
Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years
Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	40 years
Equipment Leased to Other Party
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	15 years

Summary of Significant Accounting Policies (Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Line of credit, fair value	$ 0.9	$ 1.0

Rental Activity (Details) $ in Thousands	12 Months Ended
Rental Activity (Details) $ in Thousands	Dec. 31, 2012 USD ($)
Property Subject to or Available for Operating Lease [Line Items]
2013	$ 8,630
2014	174
Thereafter	0
Total	$ 8,804
Minimum
Property Subject to or Available for Operating Lease [Line Items]
Rental arrangements, original term	6 months
Maximum
Property Subject to or Available for Operating Lease [Line Items]
Rental arrangements, original term	2 years

Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Less accumulated depreciation	$ (8,441)	$ (7,785)
Property and equipment, net	7,475	7,839
Depreciation	15,600	13,800	$ 11,700
Land and Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,606	5,459
Useful lives	30 years
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 758	758
Useful lives	39 years
Office Equipment and Furniture
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,396	1,321
Useful lives	5 years
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 573	551
Useful lives	5 years
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,433	2,337
Useful lives	7 years
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,150	$ 5,198
Useful lives	3 years

Credit Facility (Details)	12 Months Ended
Credit Facility (Details)	Dec. 31, 2012 USD ($) loan	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)
Line of Credit Facility [Line Items]
Weighted average interest rate	1.46%
Line of credit, non-current portion	$ 897,000	$ 1,017,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	30,000,000		$ 20,000,000
Potential maximum borrowing capacity	50,000,000		$ 40,000,000
Borrowing base amount available	29,000,000
Potential increase in borrowing capacity	$ 20,000,000
Borrowing base, component, % of eligible accounts receivable	80.00%
Borrowing base, component, % of eligible inventory	50.00%
Borrowing base, allowable share of total commitment amount attributable to inventory component	50.00%
Borrowing base, component, % of eligible equipment inventory	75.00%
LIBOR-based Rate \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Variable rate, applicable margin	1.50%
CB Floating Rate \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Variable rate, applicable margin	1.25%
Maximum \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum leverage ratio allowed	2.50
Default trigger, certain defaults of other company indebtedness, amount	$ 50,000
Default trigger, rendering of certain judgments, amount	$ 150,000
Maximum \| LIBOR-based Rate \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Reference rate, number of allowable LIBOR-based borrowings outstanding \| loan	3
Minimum \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Minimum commitment coverage ratio allowed	2.00

Other Long-term Liabilities (Details) - USD ($)	Jul. 30, 2008	Dec. 31, 2012	Dec. 31, 2011
Other Liabilities [Line Items]
Deferred revenue, noncurrent, related to certain staffing requirements		$ 275,000	$ 275,000
Paint and Coatings
Other Liabilities [Line Items]
Long-term purchase commitment, amount	$ 4,800,000.0
Cash received from supplier as discount toward future purchases	300,000
Liability related to deferred discount	$ 300,000	$ 227,000	$ 253,000

- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References + Details

Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current provision:
Federal	$ 332	$ 0	$ 0
State	222	75	24
Current provision for income taxes	554	75	24
Deferred provision:
Federal	6,972	5,166	4,009
State	0	628	239
Deferred provision for income taxes	6,972	5,794	4,248
Provision for income taxes	$ 7,526	$ 5,869	$ 4,272

- Definition

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal tax law to the domestic taxable Income or Loss from continuing operations.

+ References

+ Details

- Definition

The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable Income or Loss from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted state and local tax law to relevant amounts of taxable Income or Loss from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The component of total income tax expense for the period comprised of the increase (decrease) during the period in the entity's domestic deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the federally enacted tax law.

+ References

+ Details

- Definition

The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The component of total income tax expense for the period comprised of the increase (decrease) in the entity's state and local deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the applicable enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 8, 16, 17, 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

+ Details

Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Deferred income tax assets:
Net operating loss carryover	$ 1,117	$ 6,828
Other	1,459	1,218
Total deferred income tax assets	2,576	8,046
Deferred income tax liabilities:
Property and equipment	(45,242)	(43,716)
Goodwill and other intangible assets	(1,075)	(1,099)
Other	0	0
Total deferred income tax liabilities	(46,317)	(44,815)
Net deferred income tax liabilities	$ (43,741)	$ (36,769)

Income Taxes (Income Tax Reconciliation) (Details)	12 Months Ended
Income Taxes (Income Tax Reconciliation) (Details)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Statutory rate	34.00%	34.00%	34.00%
State and local taxes	1.00%	3.00%	2.00%
Other	2.00%	1.00%	2.00%
Effective rate	37.00%	38.00%	38.00%

Income Taxes (Narrative) (Details) - Federal $ in Millions	12 Months Ended
Income Taxes (Narrative) (Details) - Federal $ in Millions	Dec. 31, 2012 USD ($)
Operating Loss Carryforwards [Line Items]
Net operating toss carryforward	$ 3.2
Net operating loss carryforwards utilized in period	16.8
Net operating loss carryforwards utilized in period, resulting decrease to income tax expense	$ 5.7

Stockholders' Equity (Details) - USD ($)	Dec. 31, 2012	Dec. 31, 2011	Aug. 14, 2009
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Registration Payment Arrangement, Maximum Potential Consideration			$ 150,000,000

Stockholders' Equity (Restricted Stock) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2012	Jun. 16, 2009
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for future issuance		300,000
Shares awarded in period	70,000
Share-based compensation expense	$ 978,000
Total unrecognized compensation expense	$ 457,000
Unrecognized compensation cost related to stock options, weighted average period for recognition	2 years
Group 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Group 1 \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded in period	50,000
Group 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years

Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Dec. 31, 2012	Jun. 16, 2009	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period	20,000		20,000
Options granted in period, weighted average exercise price (in USD per share)	$ 14.89		$ 14.89
Weighted average grant date fair value of options granted (in USD per share)			$ 8.22	$ 10.00	$ 7.30
Total intrinsic value of options exercised			$ 151	$ 127	$ 400
Proceeds from exercise of stock options			180	123	407
Total income tax benefit recognized in the income statement for stock based compensation			264	148	137
Unrecognized compensation cost related to stock options	$ 200		200
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Share-based compensation expense			$ 440	$ 461	$ 804
Unrecognized compensation cost related to stock options, weighted average period for recognition			1 year 7 months
Stock Options \| 1998 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Award expiration period			10 years
Stock Options \| Common Stock \| 1998 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized		750,000				550,000
Additional shares authorized		200,000
Number of shares available for grant	280,503		280,503

Stock-Based Compensation (Valuation Assumptions) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk free rate	0.98%	2.09%	1.22%
Expected life	6 years	5 years	2 years
Expected volatility	62.37%	64.89%	64.32%
Expected dividend yield	0.00%	0.00%	0.00%

Stock-Based Compensation (Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Options, Outstanding [Roll Forward]
Outstanding, beginning of period			422,239
Granted	20,000		20,000
Exercised			(22,500)
Canceled/Forfeited			(17,917)
Expired			(7,500)
Outstanding, end of period	394,322	422,239	394,322	422,239
Exercisable, end of period	344,988		344,988
Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, weighted average exercise price, beginning of period			$ 15.06
Granted, weighted average exercise price (in USD per share)	$ 14.89		14.89
Exercised, weighted average exercise price			7.47
Canceled/Forfeited, weighted average exercise price			18.40
Expired, weighted average exercise price			16.82
Outstanding, weighted average exercise price, end of period	15.30	$ 15.06	15.30	$ 15.06
Exercisable, weighted average exercise price, end of period	$ 15.06		$ 15.06
Options, Weighted Average Remaining Contractual Term:
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	5 years 9 months 15 days	6 years 5 months 23 days
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	5 years 9 months 15 days	6 years 5 months 23 days
Exercisable, weighted average remaining contractual life (years), end of period	5 years 5 months 9 days
Options, Intrinsic Value:
Outstanding, aggregate intrinsic value, beginning of period			$ 766
Exercised, aggregate intrinsic value			151	$ 127	$ 400
Outstanding, aggregate intrinsic value, end of period	$ 910	$ 766	910	$ 766
Exercisable, aggregate intrinsic value, end of period	$ 878		$ 878
Stock Options
Options, Intrinsic Value:
Award vesting period	3 years

Stock-Based Compensation (Stock Options by Exercise Price Range) (Details)	12 Months Ended
	Dec. 31, 2012 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, shares \| shares	394,322
Options outstanding, weighted average remaining contractual life	5 years 9 months 15 days
Options outstanding, weighted average exercise price	$ 15.30
Options exercisable, shares \| shares	344,988
Options exercisable, weighted average exercise price	$ 15.06
Range of exercise prices, lower limit	0.00
Range of exercise prices, upper limit	$ 20.48
Range of Exercise Prices: 5.59 - 9.43
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, shares \| shares	79,239
Options outstanding, weighted average remaining contractual life	3 years 11 months 16 days
Options outstanding, weighted average exercise price	$ 8.61
Options exercisable, shares \| shares	79,239
Options exercisable, weighted average exercise price	$ 8.61
Range of exercise prices, lower limit	5.59
Range of exercise prices, upper limit	$ 9.43
Range of Exercise Prices: 9.44 - 15.60
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, shares \| shares	81,500
Options outstanding, weighted average remaining contractual life	6 years 7 days
Options outstanding, weighted average exercise price	$ 12.89
Options exercisable, shares \| shares	61,500
Options exercisable, weighted average exercise price	$ 12.22
Range of exercise prices, lower limit	9.44
Range of exercise prices, upper limit	$ 15.60
Range of Exercise Prices: 15.61 - 20.48
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, shares \| shares	233,583
Options outstanding, weighted average remaining contractual life	6 years 4 months 2 days
Options outstanding, weighted average exercise price	$ 18.42
Options exercisable, shares \| shares	204,249
Options exercisable, weighted average exercise price	$ 18.42
Range of exercise prices, lower limit	15.61
Range of exercise prices, upper limit	$ 20.48

Stock-Based Compensation (Summary of Unvested Stock Options) (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Dec. 31, 2012 USD ($) $ / shares shares	Dec. 31, 2012 USD ($) $ / shares shares	Dec. 31, 2011 $ / shares shares	Dec. 31, 2010 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to stock options \| $	$ 200	$ 200
Employee Service Share-based Compensation, Nonvested Awards, Stock Options, Outstanding [Roll Forward]
Unvested, beginning of period \| shares		78,666
Granted \| shares	20,000	20,000
Vested \| shares		(47,082)
Cancelled/Forfeited \| shares		(2,250)
Unvested, end of period \| shares	49,334	49,334	78,666
Employee Service Share-based Compensation, Nonvested Awards, Stock Options, Weighted Average Grant Date Fair Value [Roll Forward]
Unvested, weighted average grant date fair value, beginning of period (in USD per share) \| $ / shares		8.82
Granted, weighted average exercise price (in USD per share) \| $ / shares		$ 8.22	$ 10.00	$ 7.30
Vested, weighted average exercise price (in USD per share) \| $ / shares		8.36
Cancelled/Forfeited, weighted average exercise price (in USD per share) \| $ / shares		$ 8.98
Unvested, weighted average grant date fair value, end of period (in USD per share) \| $ / shares	9.01	9.01	8.82
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to stock options, weighted average period for recognition		1 year 7 months

Commitments and Contingencies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract]
401(k) plan, minimum eligibility age	18 years
401(k) plan, requisite service period	6 months
401(k) plan, maximum annual contribution per employee, percent	100.00%
401(k) plan, employer's matching contribution, annual vesting percentage	20.00%
401(k) plan, employer contribution, ultimate vesting percentage	100.00%
401(k) plan, employer's matching contribution, vesting term	6 years
401(k) plan, employer contribution amount	$ 282,710	$ 410,000	$ 185,000
Operating leases, maximum term	5 years
Operating leases, rent expense	$ 453,000	$ 450,000	$ 526,000

Commitments and Contingencies (Future Lease Payments) (Details) $ in Thousands	Dec. 31, 2012 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2013	$ 205
2014	56
2015	41
2016	30
Thereafter	23
Total	$ 355

Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Segment Information (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Total revenue	$ 23,548	$ 19,290	$ 24,508	$ 26,376	$ 18,645	$ 17,701	$ 13,758	$ 15,054	$ 93,722	$ 65,158	$ 53,908
Operating costs and expenses									73,507	50,298	42,544
Other income (expense)									(4)	769	(64)
Income before provision for income taxes									20,211	15,629	11,300
Sales
Segment Reporting Information [Line Items]
Total revenue									36,375	15,419	12,370
Operating costs and expenses									25,816	9,194	8,010
Other income (expense)									0	0	0
Income before provision for income taxes									10,559	6,225	4,360
Rental
Segment Reporting Information [Line Items]
Total revenue									56,477	48,619	40,670
Operating costs and expenses									23,737	20,742	16,205
Other income (expense)									0	0	0
Income before provision for income taxes									32,740	27,877	24,465
Service & Maintenance
Segment Reporting Information [Line Items]
Total revenue									870	1,120	868
Operating costs and expenses									354	458	535
Other income (expense)									0	0	0
Income before provision for income taxes									516	662	333
Corporate
Segment Reporting Information [Line Items]
Total revenue									0	0	0
Operating costs and expenses									23,600	19,904	17,794
Other income (expense)									(4)	769	(64)
Income before provision for income taxes									$ (23,604)	$ (19,135)	$ (17,858)

Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Data [Abstract]
Total revenue	$ 23,548	$ 19,290	$ 24,508	$ 26,376	$ 18,645	$ 17,701	$ 13,758	$ 15,054	$ 93,722	$ 65,158	$ 53,908
Operating income	5,523	4,241	4,829	5,622	4,666	3,643	3,222	3,329	20,215	14,860	11,364
Net income applicable to common shares	$ 3,571	$ 2,606	$ 3,000	$ 3,508	$ 3,024	$ 2,231	$ 2,008	$ 2,497	$ 12,685	$ 9,760	$ 7,028
Net income per share - Basic	$ 0.29	$ 0.21	$ 0.25	$ 0.29	$ 0.25	$ 0.18	$ 0.16	$ 0.21	$ 1.04	$ 0.80	$ 0.58
Net income per share - Diluted	$ 0.29	$ 0.21	$ 0.24	$ 0.29	$ 0.25	$ 0.18	$ 0.16	$ 0.20	$ 1.03	$ 0.80	$ 0.58

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.23)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 18
-Article 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 20
-Article 5

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.22)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e565-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 87-21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 5

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28, 29, 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

+ Details