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Document and Entity Information Document - shares	3 Months Ended
Document and Entity Information Document - shares	Mar. 31, 2012	May 09, 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-Q
Document Period End Date	Mar. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		12,226,499

Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 29,438	$ 16,390
Trade accounts receivable, net of allowance for doubtful accounts of $362 and $296 as of March 31, 2012 and December 31, 2011, respectively	3,104	5,679
Inventory, net of allowance for obsolescence of $603 and $486 as of March 31, 2011 and December 31, 2011, respectively	26,586	26,965
Prepaid income taxes	109	109
Prepaid expenses and other	534	360
Total current assets	59,771	49,503
Rental equipment, net of accumulated depreciation of $59,761 and $56,623 as of March 31, 2012 and December 31, 2011, respectively	140,604	142,473
Property and equipment, net of accumulated depreciation of $8,124 and $7,786 as of March 31, 2012 and December 31, 2011, respectively	7,739	7,839
Goodwill, net of accumulated amortization of $325, both periods	10,039	10,039
Intangibles, net of accumulated amortization of $1,967and $1,936 as of March 31, 2012 and December 31, 2011, respectively	2,251	2,282
Other assets	28	28
Total assets	220,432	212,164
Current Liabilities:
Line of credit	0	0
Accounts payable	2,619	3,730
Accrued liabilities	3,421	3,644
Current income tax liability	75	75
Deferred income	8,490	4,863
Total current liabilities	14,605	12,312
Line of Credit, noncurrent portion	1,017	1,017
Deferred income tax payable	38,919	36,769
Other long-term liabilities	517	524
Total liabilities	55,058	50,622
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; 12,207and 12,179 shares issued and outstanding as of March 31, 2012 and December 31, 2011, respectively	122	122
Additional paid-in capital	87,548	87,225
Retained earnings	77,704	74,195
Total stockholders' equity	165,374	161,542
Liabilities and Stockholders' Equity	$ 220,432	$ 212,164

Condensed Balance Sheets Balance Sheet Parentheticals - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts Receivable, Current	$ 247	$ 171
Inventory Valuation Reserves	833	250
Assets, Noncurrent [Abstract]
Accumulated Depreciation Rental Equipment	53,312	44,245
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	8,265	7,899
Goodwill, Accumulated Amortization	325	325
Intangible Assets, Accumulated Amortization	$ 1,891	$ 1,757
Stockholders' Equity Attributable to Parent [Abstract]
Preferred Stock, Shares Authorized	5,000	5,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	30,000	30,000
Common Stock, Shares, Issued	12,179	12,148
Common Stock, Shares, Outstanding	12,179	12,148

Condensed Income Statements - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue:
Sales, net	$ 12,432	$ 3,877
Rental income	13,738	10,881
Service and maintenance income	206	296
Total revenue	26,376	15,054
Operating costs and expenses:
Cost of sales, exclusive of depreciation stated separately below	9,555	2,548
Cost of rentals, exclusive of depreciation stated separately below	5,509	4,362
Cost of service and maintenance, exclusive of depreciation stated separately below	93	137
Selling, general, and administrative expense	1,810	1,386
Depreciation and amortization	3,787	3,292
Total operating costs and expenses	20,754	11,725
Operating income	5,622	3,329
Other income (expense):
Interest expense	(3)	(9)
Other income (expense)	39	708
Total other income (expense)	36	699
Income before provision for income taxes	5,658	4,028
Provision for income taxes	2,150	1,531
Net income	$ 3,508	$ 2,497
Earnings per share:
Basic	$ 0.29	$ 0.21
Diluted	$ 0.29	$ 0.20
Weighted average shares outstanding:
Basic	12,169	12,175
Diluted	12,262	12,285

Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
Condensed Statements of Cash Flows - USD ($) $ in Thousands	Mar. 31, 2012	Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 3,508	$ 2,497
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,787	3,292
Deferred taxes	2,150	1,502
Stock options and restricted stock expense	323	183
Gain on disposal of assets	0	(675)
Changes in current assets and liabilities:
Trade accounts receivables, net	2,575	(1,924)
Inventory, net	379	1,662
Prepaid income taxes and prepaid expenses	(174)	1,302
Accounts payable and accrued liabilities	(1,334)	306
Current income tax liability	0	29
Deferred income	3,627	825
NET CASH PROVIDED BY OPERATING ACTIVITIES	14,841	8,999
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(1,787)	(10,129)
Proceeds from sale of property and equipment	0	952
NET CASH USED IN INVESTING ACTIVITIES	(1,787)	(9,177)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from other long-term liabilities, net	(6)	0
Proceeds from exercise of stock options	0	198
NET CASH PROVIDED BY FINANCING ACTIVITIES	(6)	198
NET CHANGE IN CASH	13,048	20
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	16,390	16,390
CASH AND CASH EQUIVALENTS AT END OF PERIOD	29,438	19,157
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid	0	10
Income taxes paid	0	0
NON-CASH TRANSACTIONS
Transfer of rental equipment to inventory	$ 4,010	$ 0

Basis of Presentation and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2012
Basis of Presentation and Summary of Significant Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies [Text Block]	Basis of Presentation and Summary of Significant Accounting Policies These notes apply to the unaudited condensed financial statements of Natural Gas Services Group, Inc. (the "Company", “NGSG”, "Natural Gas Services Group", "we" or "our") (a Colorado corporation). We were formed on December 17, 1998 for the purposes of combining the operations of certain manufacturing, service and leasing entities. The accompanying unaudited condensed financial statements present the condensed results of our Company taken from our books and records. In our opinion, such information includes all adjustments, consisting of only normal recurring adjustments, which are necessary to make our financial position at March 31, 2012 and the results of our operations for the three months ended 2012 and 2011 not misleading. As permitted by the rules and regulations of the Securities and Exchange Commission (SEC), the accompanying condensed financial statements do not include all disclosures normally required by accounting principles generally accepted in the United States of America (GAAP). These financial statements should be read in conjunction with the financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2011 on file with the SEC. In our opinion, the condensed financial statements are a fair presentation of the financial position, results of operations and cash flows for the periods presented. The results of operations for the three months ended March 31, 2012 are not necessarily indicative of the results of operations to be expected for the full fiscal year ending December 31, 2012. Revenue recognition Revenue from the sales of custom and fabricated compressors, and flare systems is recognized upon shipment of the equipment to customers or when all conditions have been met or title is transferred to the customer. Exchange and rebuild compressor revenue is recognized when both the replacement compressor has been delivered and the rebuild assessment has been completed. Revenue from compressor 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 based upon the classification of the rental agreement. 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. Fair Value of Financial Instruments Our financial instruments consist principally of cash and cash equivalents, accounts receivable, accounts payable and our line of credit. Pursuant to ASC 820 (Accounting Standards Codification), the fair value of our cash equivalents is determined based on “Level 1” inputs, which consist of quoted prices in active markets for identical assets. We believe that the recorded values of all of our other financial instruments approximate their current fair values because of their nature and respective relatively short maturity dates or durations. Recently Issued Accounting Pronouncements In May 2011, the FASB issued ASU No. 2011-04, “Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS.” This ASU establishes a global standard for measuring amounts at fair value. This ASU is effective for fiscal years, and interim periods within those years, beginning after December 15, 2011. Early adoption is not permissible, and this ASU must be applied prospectively. The adoption of ASU No. 2011-04 did not have a material effect on the Company's financial position or results of operations. In June 2011, the Financial Accounting Standards Board ("FASB") issued ASU 2011-05, Presentation of Comprehensive Income. Currently, companies have three alternatives for presenting Comprehensive Income and its components in financial statements. Comprehensive income and its components may be reported below the total of net income in a single statement that reports the results of operations, in a separate statement of comprehensive income that begins with net income, or within the statement of changes in equity. Among the changes, ASU 2011-05 eliminates the option for entities to disclose comprehensive income and its components in the statement of changes in equity and as such, requires entities to report comprehensive income and its components either in a single continuous financial statement or in two separate but consecutive statements. In the case in which a single continuous financial statement is utilized, no longer will the statement be titled “Statement of Income and Comprehensive Income” and instead the statement will solely be titled “Statement of Comprehensive Income.” The adoption of ASU No. 2011-05 did not have a material effect on the Company's financial position or results of operations. In September 2011, FASB issued ASU 2011-08, Testing Goodwill for Impairment. Under the amendments in 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 year ended December 31, 2011. The adoption of ASU No. 2011-08 did not have a material effect on the Company's financial position or results of operations.

Stock Based Compensation

3 Months Ended

Mar. 31, 2012

Stock-Based Compensation [Abstract]

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

Stock-Based Compensation

Stock Options:

A summary of option activity under our 1998 Stock Option plan for the three months ended March 31, 2012 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		8.00
Exercised	—	—		—
Canceled/Forfeited	—	—		—
Outstanding, March 31, 2012	442,239	$	15.05	6.39	$	766
Exercisable, March 31, 2012	372,572	$	14.66	6.26	$	766

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

The following table summarizes information about our stock options outstanding at March 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
0.01 - 5.58	7,500	1.42	$	4.99	7,500	$	4.99
5.59 – 9.43	94,239	4.73	8.63		94,239	8.63
9.44 – 15.60	85,000	6.70	12.94		65,000	12.34
15.61 – 20.48	255,500	7.04	18.42		205,833	18.50
0.01 – 20.48	442,239	6.39	$	15.05	372,572	$	14.66

The summary of the status of our unvested stock options as of December 31, 2011 and changes during the three months ended March 31, 2012 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		14.89	14.89
Vested	(28,999	)		15.82
Unvested at March 31, 2011	69,667			$	8.84

As of March 31, 2012, there was $568,631 of unrecognized compensation cost related to unvested options. Such cost is expected to be recognized over a weighted-average period of 1.91 years. Total compensation expense for stock options was $104,234 and $111,708 for the three months ended March 31, 2012 and 2011, respectively.

Restricted Stock:

On January 25, 2012, the Compensation Committee awarded 70,000 shares of restricted common stock to our three named executive officers. 30,000 of the restricted shares were awarded to Stephen C. Taylor, our Chief Executive Officer, pursuant to the terms of his employment agreement. We also awarded Mr. Taylor an additional 20,000 restricted shares and our other two named executive officers 10,000 restricted shares each in connection with our review of their performance in 2011. The restricted shares issued to Messrs. Hazlett and Lawrence vest in annual one-third installments beginning on January 25, 2013, with Mr. Taylor's restricted shares subject to a one year vesting requirement. On March 28, 2012, we awarded and issued 12,500 shares of restricted stock to our Board of Directors as part payment for 2012 Directors fees. The restricted stock vests in quarterly installments beginning on March 31, 2013. Total compensation expense related to restricted stock awards was $219,877 and $79,400 for the three months ended March 31, 2012 and 2011, respectively. As of March 31, 2012, there was a total of $1,034,318 of unrecognized compensation expenses related to these shares of restricted stock.

- 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 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 2: 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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 4: 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 5: 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 6: 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 7: 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 8: 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

+ Details

Inventory

3 Months Ended

Mar. 31, 2012

Inventory [Abstract]

Inventory Disclosure [Text Block]

Inventory

Our inventory, net of allowance for obsolescence of $603,000 at March 31, 2012 and $486,000 at December 31, 2011, consisted of the following amounts:



	March 31, 2012			December 31, 2011
	(in thousands)
Raw materials	$	19,696	20,364,000	$	20,364
Work in process	6,890			6,601
	$	26,586		$	26,965

During the three months ended March 31, 2012 and March 31, 2011, there was no write off of obsolete inventory against the allowance for obsolescence.

Credit Facility	3 Months Ended
Credit Facility	Mar. 31, 2012
Credit Facility [Abstract]
Short-term Debt [Text Block]	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, 2011, we amended and renewed the Credit Agreement, which was set to expire on December 31, 2011 (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 $28,864,233 borrowing base availability at March 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 ration (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 Credit Agreement may be accelerated upon the occurrence of an event of default. As of March 31, 2012, we were in compliance with all covenants in our 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 March 31, 2012 our balance on the line of credit was $1,016,667.

Other Long-term Liabilities	3 Months Ended
Other Long-term Liabilities	Mar. 31, 2012
Other Long-term Liabilities [Abstract]
Other Liabilities Disclosure [Text Block]	Other Long-term Liabilities As of March 31, 2012, 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 as of March 31, 2012 was $242,766.

Earnings per Share

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

Earnings per Share

The following table reconciles the numerators and denominators of the basic and diluted earnings per share computation.



	Three months ended
	March 31,
	(in thousands, except per share data)
	2012		2011
Numerator:
Net income	$	3,508	$	2,497
Denominator for basic net income per common share:
Weighted average common shares outstanding	12,169		12,175
Denominator for diluted net income per share:
Weighted average common shares outstanding	12,169		12,175
Dilutive effect of stock options and restricted stock	93		110
Diluted weighted average shares	12,262		12,285
Earnings per common share:
Basic	$	0.29	$	0.21
Diluted	$	0.29	$	0.20

A total of 49,586 stock options for the three months ended March 31, 2012 and a total of 117,000 stock options for the three months ended March 31, 2011 were excluded from the diluted weighted average shares as their effect would be anti-dilutive.

Segment Information

3 Months Ended

Mar. 31, 2012

Segment Information [Abstract]

Segment Reporting Disclosure [Text Block]

Segment Information

Management believes that it operates in one business segment. Although our MD&A disclosures describe product lines in which we conduct our business; these product lines are managed and operated as one business segment. 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.

However, should a portion of our business be considered an operating segment; management has additionally reviewed the criteria for aggregation. ASC 280-10-50-11, “Aggregation Criteria”, 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 of 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.

The Company is 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..

Therefore, the Company believes that should product lines be considered separate operating segments, they meet the requirements for aggregation as described above.



For the three months ended March 31, 2012 (in thousands):
	Sales		Rental		Service & Maintenance		Corporate			Total
Revenue	$	12,432	$	13,738	$	206	$	—		$	26,376
Operating costs and expenses	9,555		5,509		93		5,597			20,754
Other income (expense)	—		—		—		36			36
Income before provision for income taxes	$	2,877	$	8,229	$	113	$	(5,561	)	$	5,658



For the three months ended March 31, 2011 (in thousands):
	Sales		Rental		Service & Maintenance		Corporate			Total
Revenue	$	3,877	$	10,881	$	296	$	—		$	15,054
Operating costs and expenses	2,548		4,362		137		4,678			11,725
Other income (expense)	—		—		—		699			699
Income before provision for income taxes	$	1,329	$	6,519	$	159	$	(3,979	)	$	4,028

- 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 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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Legal Proceedings	3 Months Ended
Legal Proceedings	Mar. 31, 2012
Legal Proceedings [Abstract]
Legal Matters and Contingencies [Text Block]	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 adverse effect on our financial position, results of operations or cash flow. We are not currently a party to any material legal proceedings and we are not aware of any other threatened litigation.