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Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2020	May 04, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	1-31398
Entity Registrant Name	NATURAL GAS SERVICES GROUP, INC.
Entity Incorporation, State or Country Code	CO
Entity Tax Identification Number	75-2811855
Entity Address, Address Line One	404 Veterans Airpark Ln., Ste 300
Entity Address, City or Town	Midland
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	79705
City Area Code	432
Local Phone Number	262-2700
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		13,499,653
Title of 12(b) Security	Common Stock, Par Value $0.01
Trading Symbol	NGS
Security Exchange Name	NYSE
Amendment Flag	false
Entity Central Index Key	0001084991
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2020
Current Fiscal Year End Date	--12-31

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 13,051	$ 11,592
Trade accounts receivable, net of allowance for doubtful accounts of $939 and $918, respectively	10,519	9,106
Inventory	19,424	21,080
Federal income tax receivable	14,992	0
Prepaid income taxes	68	40
Prepaid expenses and other	225	597
Total current assets	58,279	42,415
Long-term inventory, net of allowance for obsolescence of $37 and $24, respectively	1,108	1,068
Rental equipment, net of accumulated depreciation of $167,998 and $162,348, respectively	217,846	217,742
Property and equipment, net of accumulated depreciation of $12,682 and $12,847, respectively	22,236	21,869
Right of use assets - operating leases, net of accumulated amortization of $208 and $158, respectively	559	604
Intangibles, net of accumulated amortization of $1,914 and $1,883, respectively	1,245	1,276
Other assets	1,396	1,603
Total assets	302,669	286,577
Current Liabilities:
Accounts payable	2,255	1,975
Accrued liabilities	3,020	2,287
Line of credit	417	417
Current operating leases	187	189
Deferred income	1,190	640
Total current liabilities	7,069	5,508
Deferred income tax liability	41,683	31,243
Long-term operating leases	372	415
Other long-term liabilities	1,416	1,718
Total liabilities	50,540	38,884
Commitments and contingencies (Notes 6, 12 and 14)
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; 13,273 and 13,178 shares issued, respectively	133	132
Additional paid-in capital	110,926	110,573
Retained earnings	141,560	137,478
Treasury Shares, at cost, 38 shares	(490)	(490)
Total stockholders' equity	252,129	247,693
Total liabilities and stockholders' equity	$ 302,669	$ 286,577

Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current Assets:
Allowance for doubtful accounts	$ 939	$ 918
Allowance for obsolescence	37	24
Noncurrent Assets:
Accumulated depreciation, rental equipment	167,998	162,348
Accumulated depreciation, property and equipment	12,682	12,847
Accumulated amortization, operating lease right of use assets	208	158
Accumulated amortization, intangibles	$ 1,914	$ 1,883
Stockholders’ Equity:
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares issued (in shares)	13,273,000	13,178,000
Common stock, shares outstanding (in shares)	13,273,000	13,178,000
Treasury shares (in shares)	38,000	38,000

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue:
Revenues	$ 17,890	$ 17,991
Operating costs and expenses:
Cost of rentals, exclusive of depreciation stated separately below	7,897	6,220
Cost of sales, exclusive of depreciation stated separately below	1,739	3,699
Cost of service and maintenance, exclusive of depreciation stated separately below	125	147
Selling, general and administrative expenses	2,162	2,493
Depreciation and amortization	6,240	5,577
Total operating costs and expenses	18,163	18,136
Operating loss	(273)	(145)
Other income (expense):
Interest expense	(3)	(4)
Other (expense) income, net	(185)	305
Total other (expense) income, net	(188)	301
(Loss) income before provision for income taxes	(461)	156
Income tax benefit (expense)	4,543	(58)
Net income	$ 4,082	$ 98
Earnings per share:
Basic (in USD per share)	$ 0.31	$ 0.01
Diluted (in USD per share)	$ 0.30	$ 0.01
Weighted average shares outstanding:
Basic (in shares)	13,157	13,064
Diluted (in shares)	13,416	13,268
Rental [Member]
Revenue:
Revenues	$ 16,100	$ 13,387
Sales
Revenue:
Revenues	1,450	4,125
Service and maintenance
Revenue:
Revenues	$ 340	$ 479

Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock
Balance, beginning of period (in shares) at Dec. 31, 2018		0	13,005			0
Balance, beginning of period at Dec. 31, 2018	$ 259,232	$ 0	$ 130	$ 107,760	$ 151,342	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options, shares (in shares)			57
Exercise of common stock options	555			555
Compensation expense on common stock options	31			31
Issuance of restricted stock, shares (in shares)			71
Issuance of restricted stock	0
Compensation expense on restricted common stock	464		$ 1	463
Taxes paid related to net shares settlement of equity awards	(192)			(192)
Net income	98				98
Balance, end of period (in shares) at Mar. 31, 2019		0	13,133			0
Balance, end of period at Mar. 31, 2019	260,188	$ 0	$ 131	108,617	151,440	$ 0
Balance, beginning of period (in shares) at Dec. 31, 2019		0	13,178			(38)
Balance, beginning of period at Dec. 31, 2019	247,693	$ 0	$ 132	110,573	137,478	$ (490)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation expense on common stock options	17			17
Issuance of restricted stock, shares (in shares)			95
Issuance of restricted stock	0
Compensation expense on restricted common stock	486		$ 1	485
Taxes paid related to net shares settlement of equity awards	(149)			(149)
Net income	4,082				4,082
Balance, end of period (in shares) at Mar. 31, 2020		0	13,273			(38)
Balance, end of period at Mar. 31, 2020	$ 252,129	$ 0	$ 133	$ 110,926	$ 141,560	$ (490)

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 4,082	$ 98
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,240	5,577
Deferred income taxes	337	68
Stock-based compensation	502	495
Bad debt allowance	21	10
Gain on sale of assets	(68)	(22)
Loss (gain) on company owned life insurance	262	(99)
Changes in operating assets and liabilities:
Trade accounts receivables	(1,434)	(3,089)
Inventory	1,616	(3,986)
Federal income tax receivable	(14,992)	0
Prepaid expenses and prepaid income taxes	344	149
Accounts payable and accrued liabilities	1,013	(3,074)
Deferred income	550	52
Deferred tax liability increase due to tax law change	10,103	0
Other	(301)	75
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	8,275	(3,746)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of rental equipment and property and equipment	(6,679)	(9,230)
Purchase of company owned life insurance	(54)	(40)
Proceeds from sale of property and equipment	68	11
Proceeds from insurance claims of property and equipment	0	11
NET CASH USED IN INVESTING ACTIVITIES	(6,665)	(9,248)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments from other long-term liabilities, net	(2)	(5)
Proceeds from exercise of stock options	0	555
Taxes paid related to net share settlement of equity awards	(149)	(192)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(151)	358
NET CHANGE IN CASH AND CASH EQUIVALENTS	1,459	(12,636)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	11,592	52,628
CASH AND CASH EQUIVALENTS AT END OF PERIOD	13,051	39,992
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid	3	4
Income taxes paid	40	2
NON-CASH TRANSACTIONS
Transfer of prepaids to rental equipment and inventory	0	574
Right of use acquired through an operating lease	$ 4	$ 126

Description of Business	3 Months Ended
Description of Business	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Natural Gas Services Group, Inc. (the "Company", “NGS”, "Natural Gas Services Group", "we" or "our") (a Colorado corporation), is a leading provider of natural gas compression equipment and services to the energy industry. The Company manufactures, fabricates, rents, sells and maintains natural gas compressors and flare systems for oil and natural gas production and plant facilities. NGS is headquartered in Midland, Texas, with fabrication facilities located in Tulsa, Oklahoma and Midland, Texas, and service facilities located in major oil and natural gas producing basins in the U.S. Recent Events On January 30, 2020, the World Health Organization (“WHO”) announced a global health emergency because of a new strain of coronavirus known as COVID-19 due to the risks it imposes on the international community as the virus spreads globally. In March 2020, the WHO classified the COVID-19 outbreak as a pandemic, based on the rapid increase in exposure globally. The effects of the COVID-19 outbreak, including actions taken by businesses and governments to contain the spread of the virus, have resulted in a significant, rapid decline in global and U.S. economic conditions. This significant drop in economic activity has caused global demand for crude oil to drastically decline. According to the International Energy Agency’s (“IEA”) Oil Market Report for April 2020, global crude oil demand during the second quarter of 2020 is expected to decline 23.1 million barrels per day compared to the second quarter of 2019, a decrease of more than 20%. In March 2020, discussion between OPEC and Russia (“OPEC+”) resulted in Saudi Arabia significantly discounting the price of its crude oil, as well as Saudi Arabia and Russia significantly increasing their oil supply in April 2020. The dramatic decline in crude oil demand combined with this increase in supply resulted in unprecedented storage issues and a resulting severe lack of takeaway capacity for oil producers. As a result, crude oil prices reached record or multi-year lows in April. West Texas Intermediate (“WTI”) crude oil traded below $20 per barrel and Brent crude oil traded below $30 per barrel during the second half of April, including an anomalous trading day where WTI traded at negative values on low volume close to the end of a contract trading month. On May 6, 2020, WTI closed at $23.99 per barrel, while Brent closed at $29.72 per barrel. Given current price levels and takeaway issues, domestic producers have been rapidly shutting in production, and drilling and completion activities among exploration and production companies have dramatically declined. In April 2020, OPEC+ agreed to cut production by 9.7 million barrels per day starting in May 2020, and the IEA is projecting global oil production to drop by approximately 12 million barrels per day in May 2020. Nevertheless, given the massive decline in crude oil demand due to COVID-19, the imbalance in the global oil markets is expected to keep prices down through the remainder of 2020. These issues have resulted in an increasing number of unit returns and shut-in notices from our customers during April 2020. While we witnessed minimal change in our unit and horsepower utilization during the first quarter of 2020 compared to year-end 2019, we expect a meaningful drop in utilization among our small and medium horsepower units during the second and third quarters of 2020. Accordingly, we expect this drop in utilization and pricing pressures to negatively impact our rental revenue, rental margins and overall financial performance for the remainder of 2020. In addition, given the current economic and industry backdrop, we expect compressor sales to be minimal for the remainder of 2020, as exploration and production companies have significantly reduced their capital expenditures budgets. We have implemented various cost cutting measures with respect to operating expenses and capital expenditures. Our operating expense reductions include reductions in our headcount from both layoffs and attrition, wage freezes, centralization of certain processes for better cost control, and the enlistment of our suppliers in our cost cutting efforts. We continue to review additional opportunities to become more efficient. In addition, as we have done during prior downturns, we have reduced our capital expenditures budget. After we spent $6.7 million in capital expenditures during the first quarter of 2020, we plan to only incur another $5-$7 million in capital expenditures for the remainder of 2020, bringing our 2020 capital expenditures budget to $12-$14 million, down from $69.9 million in 2019. Finally, in keeping with current commercial precautions and practices in our industry, we have implemented new guidelines to mitigate health risks to our employees and customers during this outbreak. We have adopted remote and staggered work processes at our Midland headquarters, and have adapted our field and fabrication work processes as well. To date, our field operations have continued largely uninterrupted, as the U.S. Department of Homeland Security designated our industry as part of our country’s critical infrastructure. Remote work and work process adjustments related to COVID-19 have not impacted our ability to maintain operations or caused us to incur significant costs. In addition, we have not experienced any supply chain issues in connection with the COVID-19 outbreak. The full impact of the COVID-19 outbreak continues to evolve as of the date of this report. As such, it is uncertain as to the full magnitude that the pandemic will have on the Company's financial condition, liquidity, and future results of operations. Management is actively monitoring the global situation on its financial condition, liquidity, operations, suppliers, industry, and workforce. Given the daily evolution of the COVID-19 outbreak and the global responses to curb its spread, the Company is not able to estimate the effects of the COVID-19 outbreak on its results of operations, financial condition, or liquidity during 2020.

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2020

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Principles of Consolidation and Basis of Presentation

The accompanying unaudited condensed consolidated financial statements include the accounts of the Company, its subsidiary, NGSG Properties, LLC and the rabbi trust associated with the Company's deferred compensation plan (see Note 7). All significant intercompany accounts and transactions for the periods presented have been eliminated in consolidation.

These financial statements include all adjustments, consisting of only normal recurring adjustments, which are necessary to make our financial position at March 31, 2020 and the results of our operations for the three months ended March 31, 2020 and 2019 not misleading. As permitted by the rules and regulations of the Securities and Exchange Commission (SEC), the accompanying condensed consolidated financial statements do not include all disclosures normally required by generally accepted accounting principles in the United States of America (GAAP). These financial statements should be read in conjunction with the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2019 on file with the SEC. In our opinion, the condensed consolidated financial statements are a fair presentation of the financial position, results of operations, changes in stockholders' equity and cash flows for the periods presented.

The results of operations for the three months ended March 31, 2020 are not necessarily indicative of the results of operations to be expected for the full fiscal year ending December 31, 2020.

Revenue Recognition Policy

The Company recognizes revenue in accordance with ASC 606, Revenue from Contracts with Customers ("ASC 606"). Under ASC 606, revenue is measured based on a consideration specified in a customer’s contract, excluding any sale incentives and taxes collected on behalf of third parties (i.e. sales and property taxes). Revenue is recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration that we expect to receive for those goods or services. To recognize revenue, we (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when, or as, we satisfy the performance obligation(s). Shipping and handling costs incurred are accounted for as fulfillment costs and are included in cost of revenues in our consolidated statements of operations.

Nature of Goods and Services

The following is a description of principal activities from which the Company generates its revenue:

Rental Revenue. The Company generates revenue from renting compressors and flare systems to our customers. These contracts, which all qualify as operating leases under ASC Topic 842, Leases (ASC 842), may also include a fee for servicing the compressor or flare during the rental contract. Our rental contracts typically range from six to 24 months, with our larger horsepower compressors having contract terms of up to 60 months. Our revenue is recognized over time, with equal monthly payments over the term of the contract. After the terms of the contract have expired, a customer may renew their contract or continue renting on a monthly basis thereafter. In accordance ASC 842 – Leases, we have applied the practical expedient ASC 842-10-15-42A, which allows the Company to combine lease and non-lease components.

Sales Revenue. The Company generates revenue by the sale of custom/fabricated compressors, flare systems and parts, as well as, exchange/rebuilding customer owned compressors and sale of used rental equipment.

Custom/fabricated compressors and flare systems - The Company designs and fabricates compressors and flares based on the customer’s specifications outlined in their contract. Though the equipment being built is customized by the customer, control under these contracts does not pass to the customer until the compressor or flare package is complete and shipped, or in accordance with a bill and hold arrangement, the customer accepts title and assumes the risk and rewards of ownership. We request some of our customers to make progressive payments as the product is being built; these payments are recorded as a contract liability on the Deferred Income line on the condensed consolidated balance sheet until control has been transferred. These contracts also may include an assurance warranty clause to guarantee the product is free from defects in material and workmanship for a set duration of time; this is a standard industry practice and is not considered a performance obligation.

From time to time, upon the customer’s written request, we recognize revenue when manufacturing is complete and the equipment is ready for shipment. At the customer’s request, we will bill the customer upon completing all performance obligations, but before shipment. The customer will formally request that we ship the equipment per their direction from our manufacturing facility at a later specified date and that we segregate the equipment from our finished goods, such that they are not available to fill other orders. Per the customer’s agreement change of control is passed to the customer once the equipment is complete and ready for shipment. We have operated using bill and hold agreements with certain customers for many years, with consistent satisfactory results for both the customer and us. The credit terms on these agreements are consistent with the credit terms on all other sales. All control is shouldered by the customer and there are no exceptions to the customer’s commitment to accept and pay for the manufactured equipment. Revenues recognized related to bill and hold arrangements for the three months ended March 31, 2020 and 2019 was approximately $852,000 and $2.7 million, respectively.

Parts - Revenue is recognized after the customer obtains control of the parts. Control is passed either by the customer taking physical possession or the parts being shipped. The amount of revenue recognized is not adjusted for expected returns, as our historical part returns have been de minimis.

Exchange or rebuilding customer owned compressors - Based on the contract, the Company will either exchange a new/rebuilt compressor for the customer’s malfunctioning compressor or rebuild the customer’s compressor. Revenue is recognized after control of the replacement compressor has transferred to the customer based on the terms of the contract, i.e., by physical delivery, delivery and installment, or shipment of the compressor.

Used compressors or flares - From time to time, a customer may request to purchase a used compressor or flare out of our rental fleet. Revenue from the sale of rental equipment is recognized when the control has passed to the customer based on the terms of the contract, i.e. when the customer has taken physical possession or the equipment has been shipped.

Service and Maintenance Revenue. The Company provides routine or call-out services on customer owned equipment. Revenue is recognized after services in the contract are rendered.

Payment terms for sales revenue and service and maintenance revenue discussed above are generally 30 to 60 days, although terms for specific customers can vary. Also, transaction prices are not subject to variable consideration constraints.

Disaggregation of Revenue

The following table shows the Company's revenue disaggregated by product or service type for the three months ended March 31, 2020 and 2019:


	Three months ended March 31,
	(in thousands)
	2020		2019
Compressors - sales	$	852	$	2,708
Flares - sales	80		435
Other (parts/rebuilds) - sales	518		982
Service and maintenance	340		479
Total revenue from contracts with customers	1,790		4,604
Add: ASC 842 rental revenue	16,100		13,387
Total revenue	$	17,890	$	17,991

Contract Balances

As of March 31, 2020 and December 31, 2019, we had the following receivables and deferred income from contracts with customers:


	(in thousands)
	March 31, 2020		December 31, 2019
Accounts Receivable
Accounts receivable - contracts with customers	$	1,290	$	3,061
Accounts receivable - ASC 842	10,168		6,963
Total Accounts Receivable	$	11,458	$	10,024
Less: Allowance for doubtful accounts	(939)		(918)
Total Accounts Receivable, net	$	10,519	$	9,106

Deferred income	$	1,190	$	640

The Company recognized rental revenue of $73,000 for the three months ended March 31, 2020 that was included in deferred income at the beginning of 2020. For the year ended December 31, 2019, the Company recognized revenue of $48,000 from amounts related to sales that were included in deferred income at the beginning of 2019.

The increases (decreases) of accounts receivable and deferred income were primarily due to normal timing differences between our performance and the customers’ payments.

Transaction Price Allocated to the Remaining Performance Obligations

As of March 31, 2020, the Company did not have revenue related to unsatisfied performance obligations.

Contract Costs

The Company recognizes the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that the Company otherwise would have recognized is one year or less. These costs are included in selling, general and administrative expenses on our condensed consolidated statements of operations.

Leases

On January 1, 2019, we adopted ASC 842 using the modified retrospective method. We recognized the cumulative effect of initially applying the new lease standard and had no adjustments to retained earnings.

The new lease standard requires all leases to be reported on the balance sheet as right-of-use assets and lease obligations. We elected the practical expedients permitted under the transition guidance of the new standard that retained the lease classification and initial direct costs for any leases that existed prior to adoption of the standard. We did not reassess whether any contracts or land easements entered into prior to adoption are leases or contain leases.

The Company, as a lessor, applies the practical expedient to not separate non-lease components from lease components, therefore, accounting for each separate lease component and its associated non-lease component, as a single lease component. Each lease that 1) contains the same timing and pattern of transfer for lease and non-lease components; and 2) if the lease component, if accounted for separately, would be classified as an operating lease, the Company elects to not separate non-lease components from lease components.

Inventory

Inventory (current and long-term) is valued at the lower of cost and net realizable value. The cost of inventories is determined by the weighted average method. We regularly review inventory quantities on hand and record a provision for excess and obsolete inventory based primarily on current and anticipated customer demand and production requirements. The Company accesses anticipated customer demand based on current and upcoming capital expenditure budgets of its major

customers as well as other significant companies in the industry, along with oil and natural gas price forecasts and other factors affecting the industry. In addition, our long-term inventory consists of raw materials that remain viable but which the Company does not expect to sell within the next year.

Rental Equipment and Property and Equipment

Rental equipment and property and equipment are recorded at cost less accumulated depreciation, except for work-in-progress on new rental equipment which is recorded at cost until it’s complete and added to the fleet. Depreciation is computed using the straight-line method over the estimated useful lives of the assets. Our rental equipment has an estimated useful life between 15 and 25 years, while our property and equipment has an estimate useful lives which range from 3 to 39 years. The majority of our property and equipment, including rental equipment, is a direct cost to generating revenue.

We assess the impairment of rental equipment and property and equipment whenever events or changes in circumstances indicate that the net recorded amount may not be recoverable. The following factors could trigger an impairment review: significant underperformance relative to historical or projected future cash flows; significant adverse changes in the extent or manner in which asset (or asset group) is being used or its condition, including a meaningful drop in fleet utilization over the prior four quarters; significant negative industry or company-specific trends or actions, including meaningful capital expenditure budget reductions by our major customers or other sizable exploration and production or midstream companies, as well as significant declines in oil and natural gas prices; legislative changes prohibiting us from leasing our units or flares; or poor general economic conditions. An impairment loss is recognized if the future undiscounted cash flows associated with the asset (or asset group) and the estimated fair value of the asset are less than the asset's carrying value.

Sales of equipment out of the rental fleet are included with sales revenue and cost of sales, while retirements of units are shown as a separate operating expense. Gains and losses resulting from sales and dispositions of other property and equipment are included within other income (expense). Maintenance and repairs are charged to cost of rentals as incurred.

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 carryforwards. 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. We assess the likelihood that our deferred tax assets will be recovered from future taxable income and, to the extent we believe that recovery is not probable, we establish a valuation allowance. To the extent we establish a valuation allowance or increase this allowance in a period, we include an expense in the tax provision in our condensed consolidated statements of operations.

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.

Our policy regarding income tax interest and penalties is to expense those items as other expense.

We account for uncertain tax positions in accordance with guidance in ASC 740, which prescribes the minimum recognition threshold a tax position taken or expected to be taken in a tax return is required to meet before being recognized in the condensed consolidated financial statements. We have no uncertain tax positions as of March 31, 2020.

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act") was enacted in response to the economic impact caused the COVID-19 pandemic. The CARES Act, among other things, permits federal income tax net operating loss ("NOL") carryovers and carrybacks to offset 100% of taxable income for taxable years beginning before 2021. In addition, the CARES Act allows NOLs incurred in 2018, 2019, and 2020 to be carried back to each of the five preceding taxable years to generate a refund of previously paid federal income taxes. Please read Note 4, Federal Income Tax Receivable for a discussion about the impact on our condensed consolidated financial statements.

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. ASC 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.

Management believes that the fair value of our cash and cash equivalents, trade receivables, accounts payable and line of credit at March 31, 2020 and December 31, 2019 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 products 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. Our CODM does not make resource allocation decisions or access 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 December 2019, the FASB issued ASU 2019-12, Income Taxes (ASC Topic 740), which simplifies accounting for income taxes by removing certain exceptions to various tax accounting principles and clarifies other existing guidance in order to improve consistency of application. These amendments are effective for public entities for interim and annual periods

beginning after December 15, 2020. We are currently evaluating the impact of ASU 2019-12 on our consolidated financial statements and note disclosures.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (ASC Topic 326): Measurement of Credit Losses on Financial Instruments. The amendments to ASC Topic 326 require immediate recognition of estimated credit losses expected to occur over the remaining life of many financial assets, including trade receivables. For companies that qualify as smaller reporting companies, the amendments in this update are effective for interim and annual periods beginning after January 1, 2023. We are currently evaluating the impact of ASU 2016-13 on our consolidated financial statements and note disclosures.

Revisions of Prior Period Financial Statements

As stated in our Annual Report on Form 10-K for the year ended December 31, 2019, we revised our consolidated financial statements for the years ended December 31, 2018 and 2017, as well as for interim periods in 2019 and 2018, for immaterial operating costs and expenses that were inappropriately capitalized. The following is a summary of the revisions to our unaudited, condensed consolidated financial statements for the three months ended March 31, 2019:

Revised Condensed Consolidated Statement of Operations


	For the three months ended March 31, 2019
($ in thousands)	As Reported		Revisions		As Revised
Total revenue	$	17,991	$	—	$	17,991
Operating costs and expenses:
Cost of rentals, exclusive of depreciation stated separately below	5,885		335		6,220
Depreciation and amortization	5,558		19		5,577
Total operating costs and expenses	17,782		354		18,136
Operating income (loss)	209		(354)		(145)
Income before provision for income taxes	510		(354)		156
Income tax (expense) benefit	(153)		95		(58)
Net income (loss)	357		(259)		98
Earnings (loss) per share, basic	0.03		(0.02)		0.01
Earnings (loss) per share, diluted	0.03		(0.02)		0.01

Revised Condensed Consolidated Statement of Stockholders' Equity


	For the three months ended March 31, 2019
($ in thousands)	As Reported		Revisions		As Revised
Retained earnings balance at January 1, 2019	$	152,291	$	(949)	$	151,342
Total stockholders' equity at January 1, 2019	260,181		(949)		259,232
Net income (loss)	357		(259)		98
Retained earnings balance at March 31, 2019	152,648		(1,208)		151,440
Total stockholders' equity at March 31, 2019	261,396		(1,208)		260,188

Revised Condensed Consolidated Statement of Cash Flows


	For the three months ended March 31, 2019
($ in thousands)	As Reported		Revisions		As Revised
Cash flows from operating activities:
Net income (loss)	$	357	$	(259)	$	98
Depreciation and amortization	5,558		19		5,577
Deferred taxes	157		(89)		68
Inventory (increase) decrease	(4,468)		482		(3,986)
Prepaid expenses and prepaid income taxes decrease (increase)	202		(53)		149
Net cash (used in) provided by operating activities	(3,846)		100		(3,746)
Cash flows from investing activities:
Purchase of rental equipment, property and other equipment	(9,130)		(100)		(9,230)
Net cash used in investing activities	(9,148)		(100)		(9,248)
Net change in cash and cash equivalents	(12,636)		—		(12,636)

Inventory

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Inventory

Our inventory, net of allowance for obsolescence of $37,000 at March 31, 2020 and $24,000 at December 31, 2019, consisted of the following amounts:


	(in thousands)
	March 31, 2020		December 31, 2019
Raw materials - current	$	17,407	$	19,388
Work-in-process	2,017		1,692

Inventory - current	19,424		21,080
Raw materials - long term (net of allowances of $37 and $24, respectively)	1,108		1,068
Inventory - total	$	20,532	$	22,148

Our long-term inventory consists of raw materials that remain viable but that the Company does not expect to sell or use within the year. During the three months ended March 31, 2020 and 2019, there were no write-offs of obsolete inventory against the allowance for obsolescence.

Federal Income Tax Receivable	3 Months Ended
Federal Income Tax Receivable	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Federal Income Tax Receivable	Federal Income Tax ReceivableAs discussed in Note 2, the CARES Act allows NOLs incurred in 2018, 2019, and 2020 to be carried back to each of the five preceding taxable years to generate a refund of previously paid federal income taxes. The Company generated significant NOLs during 2018 and 2019, and plans to carryback these losses for five years. Accordingly, as of March 31, 2020, the Company recorded a federal income tax receivable of $15.0 million and an increase to its deferred income tax liability of $10.1 million on its condensed consolidated balance sheet. In addition, the Company recorded a current income tax benefit of $4.9 million on its condensed consolidated statement of operations for the three months ended March 31, 2020.

Rental Equipment

3 Months Ended

Mar. 31, 2020

Property, Plant and Equipment [Abstract]

Rental Equipment

Our rental equipment and associated accumulated depreciation as of March 31, 2020 and December 31, 2019, respectively, consisted of the following:


	(in thousands)
	March 31, 2020		December 31, 2019
Compressor units	$	378,366	$	370,961
Work-in-progress	7,478		9,129
Rental equipment	385,844		380,090
Accumulated depreciation	(167,998)		(162,348)
Rental equipment, net of accumulated depreciation	$	217,846	$	217,742

Leases

3 Months Ended

Mar. 31, 2020

Leases [Abstract]

Leases

The Company determines if an arrangement is a lease at inception by assessing whether it conveys the right to control the use of an identified asset for a period of time in exchange for consideration. The Company’s leases are primarily related to property leases for its field offices. The Company's leases have remaining lease terms of one to 10 years. Renewal and termination options are included in the lease term when it is reasonably certain that the Company will exercise the option. The Company's lease agreements do not contain any contingent rental payments, material residual guarantees or material restrictive covenants.

ROU assets and lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. As substantially all of the Company's leases do not provide an implicit rate, the Company uses its incremental borrowing rate to determine the present value of lease payments. Based on the present value of lease payments for the Company's existing leases, the Company recorded net lease assets and lease liabilities of approximately $451,000, respectively, upon adoption. The Company had no finance leases. The new lease standard did not materially impact the Company's condensed consolidated statements of operations and had no impact on the Company's condensed consolidated statements of cash flows.

The impact of the new lease standard on the March 31, 2020 condensed consolidated balance sheet was as follows:


	Classification on the Condensed Consolidated Balance Sheet	March 31, 2020
		(in thousands, except years)
Operating lease assets	Right of use assets-operating leases	$	559

Current lease liabilities	Current operating leases	$	187
Noncurrent lease liabilities	Long-term operating leases	372
Total lease liabilities		$	559

Weighted average remaining lease term in years		2.3
Implicit Rate		3.1		%

Operating lease costs are recognized on a straight-line basis over the lease term. Total operating lease costs for the three months ended March 31, 2020 was approximately $122,000.


	March 31, 2020
	(in thousands)
Cash paid for amounts included in the measurement of lease liabilities
Operating lease cost ^{(1) (2)}	$	122

(1) Lease costs are classified on the condensed consolidated statements of operations in cost of sales, cost of compressors and selling, general and administrative expenses.

(2) Includes costs of $74,000 for leases with terms of 12 months or less and $48,000 for leases with terms greater than 12 months.

The following table shows the future maturities of lease liabilities as of March 31, 2020:


Years Ending December 31,	Lease Liabilities
	(in thousands)
2020 (excluding the three months ended March 31, 2020)	$	154
2021	174
2022	47
2023	38
2024	38
Thereafter	168
Total lease payments	619
Less: Imputed interest	(60)
Total	$	559

Credit Facility	3 Months Ended
Credit Facility	Mar. 31, 2020
Debt Disclosure [Abstract]
Credit Facility	Credit Facility We have a senior secured revolving credit agreement the ("Amended Credit Agreement") with JP Morgan Chase Bank, N.A (the "Lender") with an aggregate commitment of $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). 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. The Lender may adjust the borrowing base components if material deviations in the collateral are discovered in future audits of the collateral. We had $29.5 million borrowing base availability at March 31, 2020 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 1.25%. For purposes of the CB Floating Rate, the Applicable Margin is 1.50%. For the three month period ended March 31, 2020, our weighted average interest rate was 2.88%. 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, 2020, 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 compressors, the book value of which 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 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 March 31, 2020, 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 March 31, 2020 and December 31, 2019, our outstanding balance on the line of credit was $417,000.

Deferred Compensation Plan	3 Months Ended
Deferred Compensation Plan	Mar. 31, 2020
Postemployment Benefits [Abstract]
Deferred Compensation Plan	Deferred Compensation Plan The Company has a non-qualified deferred compensation plan for executive officers, directors and certain eligible employees. The assets of the deferred compensation plan are held in a rabbi trust and are subject to additional risk of loss in the event of bankruptcy or insolvency of the Company. The plan allows for deferral of up to 90% of a participant’s base salary, bonus, commissions, director fees and restricted stock unit awards. A Company owned life insurance policy held in a rabbi trust is utilized as a source of funding for the plan. The cash surrender value of the life insurance policy is $1.3 million and $1.5 million as of March 31, 2020 and December 31, 2019, respectively. We reported in other (expense) income in the condensed consolidated statements of operations a loss related to the policy of approximately $262,000 and a gain of approximately $99,000 for the three months ended March 31, 2020 and 2019, respectively. For deferrals of base salary, bonus, commissions and director fees, settlement payments are made to participants in cash, either in a lump sum or in periodic installments. The obligation to pay the deferred compensation and the deferred director fees is adjusted to reflect the positive or negative performance of investment measurement options selected by each participant. The deferred compensation liability, which is included in other long-term liabilities in the condensed consolidated balance sheet, was $1.4 million and $1.7 million as of March 31, 2020 and December 31, 2019, respectively. For deferrals of restricted stock units, the plan does not allow for diversification, therefore, distributions are paid in shares of common stock and the obligation is carried at grant value. As of March 31, 2020 and 2019, respectively, we had 36,500 and 63,062 unvested restricted stock units being deferred. As of March 31, 2020, we had released and issued 138,252 shares with a value of $2.2 million to the deferred compensation plan. As of March 31, 2019, we had released and issued 78,771 shares with a value of $1.7 million to the deferred compensation plan.

Stock-Based Compensation

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

Stock-Based Compensation

Stock Options:

A summary of all option activity as of December 31, 2019, and changes during the three months ended March 31, 2020 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, 2019	208,334	$	23.67	3.66	$	—
Granted	—	—


Expired	40,000	19.11
Outstanding, March 31, 2020	168,334	$	24.75	4.26	$	—
Exercisable, March 31, 2020	168,334	$	24.75	4.26	$	—

The following table summarizes information about our stock options outstanding at March 31, 2020:


Range of Exercise Prices	Options Outstanding												Options Exercisable
		Shares		Weighted Average Remaining Contractual Life (years)			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price
$0.01-15.70	8,500		1.82		$	14.89		8,500		$	14.89
$15.71-17.81	16,000		0.82		17.81			16,000		17.81
$17.82-20.48	20,500		2.97		18.75			20,500		18.75
$20.49-33.36	123,334		5.09		27.33			123,334		27.33
	168,334		4.26		$	24.75		168,334		$	24.75

The summary of the status of our unvested stock options as of December 31, 2019 and changes during the three months ended March 31, 2020 is presented below.


Unvested stock options:	Shares	Weighted Average Grant Date Fair Value Per Share
Unvested at December 31, 2019	10,433	$	11.93
Granted	—	—
Vested	(10,433)	11.93
Canceled/Forfeited	—	—
Unvested at March 31, 2020	—	$	—

As of March 31, 2020, there were no unrecognized compensation cost related to unvested options. Total compensation expense for stock options was $17,000 and $31,000 for the three months ended March 31, 2020 and 2019, respectively.

Restricted Shares/Units:

As of March 31, 2020, the Compensation Committee had not awarded any restricted shares/units to the Company's executive officers based on the Company's 2019 performance. These restricted shares/units typically vest over three years, in equal annual installments, beginning of the first anniversary of the date of the award. In addition, as of March 31, 2020, we had not awarded any restricted shares/units to the independent members of our Board of Directors as partial payment for 2020

services as directors. These restricted shares/units issued to our directors typically vest over one year in quarterly installments. Total compensation expense related to restricted awards was $0.5 million and $0.5 million for the three months ended March 31, 2020 and 2019, respectively. As of March 31, 2020, there was a total of $2.8 million of unrecognized compensation expense related to these shares/units which is expected to be recognized over the next two years.

(Loss) Earnings per Share

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

(Loss) Earnings per Share

The following table reconciles the numerators and denominators of the basic and diluted (loss) earnings per share computation (in thousands, except per share data):


	Three months ended
	March 31,
	2020		2019
Numerator:
Net income	$	4,082	$	98
Denominator for earnings per basic common share:
Weighted average common shares outstanding	13,157		13,064
Denominator for earnings per diluted common share:
Weighted average common shares outstanding	13,157		13,064
Dilutive effect of stock options and restricted shares	259		204
Diluted weighted average shares	13,416		13,268
Earnings per common share:
Basic	$	0.31	$	0.01
Diluted	$	0.30	$	0.01

In the three months ended March 31, 2020, options to purchase 182,839 weighted average shares of common stock with exercise prices ranging from $14.89 to $33.36 were not included in the computation of diluted earnings per share due to their antidilutive effect.

In the three months ended March 31, 2019, options to purchase 176,523 weighted average shares of common stock with exercise prices ranging from $18.75 to $33.36 were not included in the computation of diluted earnings per share due to their antidilutive effect.

Related Party	3 Months Ended
Related Party	Mar. 31, 2020
Related Party Transactions [Abstract]
Related Party	Related Party In 2016, we entered into a joint venture partnership, N-G, LLC (‘N-G”), with Genis Holdings, LLC (“Genis”) to explore new technologies for wellhead compression. NGS and Genis both share 50% ownership of N-G. We account for this investment under the equity method. In 2018, we ordered some compressor packages from Genis, totaling $1.0 million. The compressors were completed and paid in full at December 31, 2019.

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies 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 threatened material litigation. The Company also has a remaining contractual obligation related to the construction of a new corporate office of approximately $375,000, which we intend to finance with cash on hand. Construction of a new office began in late 2017 and was completed in 2019.

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events As previously announced, on April 10, 2020, the Company entered into a promissory note (the “Loan”) for an unsecured loan in the amount of $4.6 million through the Paycheck Protection Program (“PPP”) established by the CARES Act and administered by the U.S. Small Business Administration ("SBA"). The Loan was made for the purpose of securing funding for salaries and wages of employees that may have otherwise been displaced by the outbreak of COVID-19 and the resulting detrimental impact on the Company’s business. JPMorgan Chase Bank, N.A. (the “Lender”) processed and funded the Loan. On April 23, 2020, the SBA advised that companies that applied for and received PPP loans that had other sufficient sources of liquidity that would not be "significantly detrimental" to their businesses may be subject to increased scrutiny and potential liability unless these companies repaid their loans in full by May 7, 2020. While the Company believes it was justified in seeking the Loan and the funds received were earmarked for the purposes set forth in the original PPP regulations, the Company voluntarily repaid the Loan, with accrued interest, to the Lender on May 4, 2020.

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2020
Accounting Policies [Abstract]
Basis of Accounting	The accompanying unaudited condensed consolidated financial statements include the accounts of the Company, its subsidiary, NGSG Properties, LLC and the rabbi trust associated with the Company's deferred compensation plan (see Note 7). All significant intercompany accounts and transactions for the periods presented have been eliminated in consolidation. These financial statements include all adjustments, consisting of only normal recurring adjustments, which are necessary to make our financial position at March 31, 2020 and the results of our operations for the three months ended March 31, 2020 and 2019 not misleading. As permitted by the rules and regulations of the Securities and Exchange Commission (SEC), the accompanying condensed consolidated financial statements do not include all disclosures normally required by generally accepted accounting principles in the United States of America (GAAP). These financial statements should be read in conjunction with the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2019 on file with the SEC. In our opinion, the condensed consolidated financial statements are a fair presentation of the financial position, results of operations, changes in stockholders' equity and cash flows for the periods presented. The results of operations for the three months ended March 31, 2020 are not necessarily indicative of the results of operations to be expected for the full fiscal year ending December 31, 2020.
Revenue Recognition Policy	Revenue Recognition Policy The Company recognizes revenue in accordance with ASC 606, Revenue from Contracts with Customers ("ASC 606"). Under ASC 606, revenue is measured based on a consideration specified in a customer’s contract, excluding any sale incentives and taxes collected on behalf of third parties (i.e. sales and property taxes). Revenue is recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration that we expect to receive for those goods or services. To recognize revenue, we (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when, or as, we satisfy the performance obligation(s). Shipping and handling costs incurred are accounted for as fulfillment costs and are included in cost of revenues in our consolidated statements of operations. Nature of Goods and Services The following is a description of principal activities from which the Company generates its revenue: Rental Revenue. The Company generates revenue from renting compressors and flare systems to our customers. These contracts, which all qualify as operating leases under ASC Topic 842, Leases (ASC 842), may also include a fee for servicing the compressor or flare during the rental contract. Our rental contracts typically range from six to 24 months, with our larger horsepower compressors having contract terms of up to 60 months. Our revenue is recognized over time, with equal monthly payments over the term of the contract. After the terms of the contract have expired, a customer may renew their contract or continue renting on a monthly basis thereafter. In accordance ASC 842 – Leases, we have applied the practical expedient ASC 842-10-15-42A, which allows the Company to combine lease and non-lease components. Sales Revenue. The Company generates revenue by the sale of custom/fabricated compressors, flare systems and parts, as well as, exchange/rebuilding customer owned compressors and sale of used rental equipment. Custom/fabricated compressors and flare systems - The Company designs and fabricates compressors and flares based on the customer’s specifications outlined in their contract. Though the equipment being built is customized by the customer, control under these contracts does not pass to the customer until the compressor or flare package is complete and shipped, or in accordance with a bill and hold arrangement, the customer accepts title and assumes the risk and rewards of ownership. We request some of our customers to make progressive payments as the product is being built; these payments are recorded as a contract liability on the Deferred Income line on the condensed consolidated balance sheet until control has been transferred. These contracts also may include an assurance warranty clause to guarantee the product is free from defects in material and workmanship for a set duration of time; this is a standard industry practice and is not considered a performance obligation. From time to time, upon the customer’s written request, we recognize revenue when manufacturing is complete and the equipment is ready for shipment. At the customer’s request, we will bill the customer upon completing all performance obligations, but before shipment. The customer will formally request that we ship the equipment per their direction from our manufacturing facility at a later specified date and that we segregate the equipment from our finished goods, such that they are not available to fill other orders. Per the customer’s agreement change of control is passed to the customer once the equipment is complete and ready for shipment. We have operated using bill and hold agreements with certain customers for many years, with consistent satisfactory results for both the customer and us. The credit terms on these agreements are consistent with the credit terms on all other sales. All control is shouldered by the customer and there are no exceptions to the customer’s commitment to accept and pay for the manufactured equipment. Revenues recognized related to bill and hold arrangements for the three months ended March 31, 2020 and 2019 was approximately $852,000 and $2.7 million, respectively. Parts - Revenue is recognized after the customer obtains control of the parts. Control is passed either by the customer taking physical possession or the parts being shipped. The amount of revenue recognized is not adjusted for expected returns, as our historical part returns have been de minimis. Exchange or rebuilding customer owned compressors - Based on the contract, the Company will either exchange a new/rebuilt compressor for the customer’s malfunctioning compressor or rebuild the customer’s compressor. Revenue is recognized after control of the replacement compressor has transferred to the customer based on the terms of the contract, i.e., by physical delivery, delivery and installment, or shipment of the compressor. Used compressors or flares - From time to time, a customer may request to purchase a used compressor or flare out of our rental fleet. Revenue from the sale of rental equipment is recognized when the control has passed to the customer based on the terms of the contract, i.e. when the customer has taken physical possession or the equipment has been shipped. Service and Maintenance Revenue. The Company provides routine or call-out services on customer owned equipment. Revenue is recognized after services in the contract are rendered. Payment terms for sales revenue and service and maintenance revenue discussed above are generally 30 to 60 days, although terms for specific customers can vary. Also, transaction prices are not subject to variable consideration constraints. Contract Costs The Company recognizes the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that the Company otherwise would have recognized is one year or less. These costs are included in selling, general and administrative expenses on our condensed consolidated statements of operations.
Leases	Leases On January 1, 2019, we adopted ASC 842 using the modified retrospective method. We recognized the cumulative effect of initially applying the new lease standard and had no adjustments to retained earnings. The new lease standard requires all leases to be reported on the balance sheet as right-of-use assets and lease obligations. We elected the practical expedients permitted under the transition guidance of the new standard that retained the lease classification and initial direct costs for any leases that existed prior to adoption of the standard. We did not reassess whether any contracts or land easements entered into prior to adoption are leases or contain leases. The Company, as a lessor, applies the practical expedient to not separate non-lease components from lease components, therefore, accounting for each separate lease component and its associated non-lease component, as a single lease component. Each lease that 1) contains the same timing and pattern of transfer for lease and non-lease components; and 2) if the lease component, if accounted for separately, would be classified as an operating lease, the Company elects to not separate non-lease components from lease components.
Inventory	Inventory Inventory (current and long-term) is valued at the lower of cost and net realizable value. The cost of inventories is determined by the weighted average method. We regularly review inventory quantities on hand and record a provision for excess and obsolete inventory based primarily on current and anticipated customer demand and production requirements. The Company accesses anticipated customer demand based on current and upcoming capital expenditure budgets of its major customers as well as other significant companies in the industry, along with oil and natural gas price forecasts and other factors affecting the industry. In addition, our long-term inventory consists of raw materials that remain viable but which the Company does not expect to sell within the next year.
Rental Equipment and Property and Equipment	Rental Equipment and Property and EquipmentRental equipment and property and equipment are recorded at cost less accumulated depreciation, except for work-in-progress on new rental equipment which is recorded at cost until it’s complete and added to the fleet. Depreciation is computed using the straight-line method over the estimated useful lives of the assets. Our rental equipment has an estimated useful life between 15 and 25 years, while our property and equipment has an estimate useful lives which range from 3 to 39 years. The majority of our property and equipment, including rental equipment, is a direct cost to generating revenue.
Impairment of Rental Equipment	We assess the impairment of rental equipment and property and equipment whenever events or changes in circumstances indicate that the net recorded amount may not be recoverable. The following factors could trigger an impairment review: significant underperformance relative to historical or projected future cash flows; significant adverse changes in the extent or manner in which asset (or asset group) is being used or its condition, including a meaningful drop in fleet utilization over the prior four quarters; significant negative industry or company-specific trends or actions, including meaningful capital expenditure budget reductions by our major customers or other sizable exploration and production or midstream companies, as well as significant declines in oil and natural gas prices; legislative changes prohibiting us from leasing our units or flares; or poor general economic conditions. An impairment loss is recognized if the future undiscounted cash flows associated with the asset (or asset group) and the estimated fair value of the asset are less than the asset's carrying value. Sales of equipment out of the rental fleet are included with sales revenue and cost of sales, while retirements of units are shown as a separate operating expense. Gains and losses resulting from sales and dispositions of other property and equipment are included within other income (expense). Maintenance and repairs are charged to cost of rentals as incurred.
Income Taxes	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 carryforwards. 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. We assess the likelihood that our deferred tax assets will be recovered from future taxable income and, to the extent we believe that recovery is not probable, we establish a valuation allowance. To the extent we establish a valuation allowance or increase this allowance in a period, we include an expense in the tax provision in our condensed consolidated statements of operations. 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. Our policy regarding income tax interest and penalties is to expense those items as other expense. We account for uncertain tax positions in accordance with guidance in ASC 740, which prescribes the minimum recognition threshold a tax position taken or expected to be taken in a tax return is required to meet before being recognized in the condensed consolidated financial statements.
Fair Value Measurement	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. ASC 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. Management believes that the fair value of our cash and cash equivalents, trade receivables, accounts payable and line of credit at March 31, 2020 and December 31, 2019 approximate their carrying values due to the short-term nature of the instruments or the use of prevailing market interest rates.
Segment and Related Information	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 products 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. Our CODM does not make resource allocation decisions or access 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	Recently Issued Accounting Pronouncements In December 2019, the FASB issued ASU 2019-12, Income Taxes (ASC Topic 740), which simplifies accounting for income taxes by removing certain exceptions to various tax accounting principles and clarifies other existing guidance in order to improve consistency of application. These amendments are effective for public entities for interim and annual periods beginning after December 15, 2020. We are currently evaluating the impact of ASU 2019-12 on our consolidated financial statements and note disclosures. In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (ASC Topic 326): Measurement of Credit Losses on Financial Instruments. The amendments to ASC Topic 326 require immediate recognition of estimated credit losses expected to occur over the remaining life of many financial assets, including trade receivables. For companies that qualify as smaller reporting companies, the amendments in this update are effective for interim and annual periods beginning after January 1, 2023. We are currently evaluating the impact of ASU 2016-13 on our consolidated financial statements and note disclosures.

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2020

Accounting Policies [Abstract]

Disaggregation of Revenue

The following table shows the Company's revenue disaggregated by product or service type for the three months ended March 31, 2020 and 2019:


	Three months ended March 31,
	(in thousands)
	2020		2019
Compressors - sales	$	852	$	2,708
Flares - sales	80		435
Other (parts/rebuilds) - sales	518		982
Service and maintenance	340		479
Total revenue from contracts with customers	1,790		4,604
Add: ASC 842 rental revenue	16,100		13,387
Total revenue	$	17,890	$	17,991

Schedule of Contract with Customer, Asset and Liability

As of March 31, 2020 and December 31, 2019, we had the following receivables and deferred income from contracts with customers:


	(in thousands)
	March 31, 2020		December 31, 2019
Accounts Receivable
Accounts receivable - contracts with customers	$	1,290	$	3,061
Accounts receivable - ASC 842	10,168		6,963
Total Accounts Receivable	$	11,458	$	10,024
Less: Allowance for doubtful accounts	(939)		(918)
Total Accounts Receivable, net	$	10,519	$	9,106

Deferred income	$	1,190	$	640

Schedules of Revisions of Prior Period Financial Statements

The following is a summary of the revisions to our unaudited, condensed consolidated financial statements for the three months ended March 31, 2019:

Revised Condensed Consolidated Statement of Operations


	For the three months ended March 31, 2019
($ in thousands)	As Reported		Revisions		As Revised
Total revenue	$	17,991	$	—	$	17,991
Operating costs and expenses:
Cost of rentals, exclusive of depreciation stated separately below	5,885		335		6,220
Depreciation and amortization	5,558		19		5,577
Total operating costs and expenses	17,782		354		18,136
Operating income (loss)	209		(354)		(145)
Income before provision for income taxes	510		(354)		156
Income tax (expense) benefit	(153)		95		(58)
Net income (loss)	357		(259)		98
Earnings (loss) per share, basic	0.03		(0.02)		0.01
Earnings (loss) per share, diluted	0.03		(0.02)		0.01

Revised Condensed Consolidated Statement of Stockholders' Equity


	For the three months ended March 31, 2019
($ in thousands)	As Reported		Revisions		As Revised
Retained earnings balance at January 1, 2019	$	152,291	$	(949)	$	151,342
Total stockholders' equity at January 1, 2019	260,181		(949)		259,232
Net income (loss)	357		(259)		98
Retained earnings balance at March 31, 2019	152,648		(1,208)		151,440
Total stockholders' equity at March 31, 2019	261,396		(1,208)		260,188

Revised Condensed Consolidated Statement of Cash Flows


	For the three months ended March 31, 2019
($ in thousands)	As Reported		Revisions		As Revised
Cash flows from operating activities:
Net income (loss)	$	357	$	(259)	$	98
Depreciation and amortization	5,558		19		5,577
Deferred taxes	157		(89)		68
Inventory (increase) decrease	(4,468)		482		(3,986)
Prepaid expenses and prepaid income taxes decrease (increase)	202		(53)		149
Net cash (used in) provided by operating activities	(3,846)		100		(3,746)
Cash flows from investing activities:
Purchase of rental equipment, property and other equipment	(9,130)		(100)		(9,230)
Net cash used in investing activities	(9,148)		(100)		(9,248)
Net change in cash and cash equivalents	(12,636)		—		(12,636)

Inventory (Tables)

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Schedule of Inventory

Our inventory, net of allowance for obsolescence of $37,000 at March 31, 2020 and $24,000 at December 31, 2019, consisted of the following amounts:


	(in thousands)
	March 31, 2020		December 31, 2019
Raw materials - current	$	17,407	$	19,388
Work-in-process	2,017		1,692

Inventory - current	19,424		21,080
Raw materials - long term (net of allowances of $37 and $24, respectively)	1,108		1,068
Inventory - total	$	20,532	$	22,148

Rental Equipment (Tables)

3 Months Ended

Mar. 31, 2020

Property, Plant and Equipment [Abstract]

Schedule of Rental Equipment

Our rental equipment and associated accumulated depreciation as of March 31, 2020 and December 31, 2019, respectively, consisted of the following:


	(in thousands)
	March 31, 2020		December 31, 2019
Compressor units	$	378,366	$	370,961
Work-in-progress	7,478		9,129
Rental equipment	385,844		380,090
Accumulated depreciation	(167,998)		(162,348)
Rental equipment, net of accumulated depreciation	$	217,846	$	217,742

Leases (Tables)

3 Months Ended

Mar. 31, 2020

Leases [Abstract]

Schedule of Balance Sheet Impact

The impact of the new lease standard on the March 31, 2020 condensed consolidated balance sheet was as follows:


	Classification on the Condensed Consolidated Balance Sheet	March 31, 2020
		(in thousands, except years)
Operating lease assets	Right of use assets-operating leases	$	559

Current lease liabilities	Current operating leases	$	187
Noncurrent lease liabilities	Long-term operating leases	372
Total lease liabilities		$	559

Weighted average remaining lease term in years		2.3
Implicit Rate		3.1		%

Schedule of Cash Flow Impact


	March 31, 2020
	(in thousands)
Cash paid for amounts included in the measurement of lease liabilities
Operating lease cost ^{(1) (2)}	$	122

(1) Lease costs are classified on the condensed consolidated statements of operations in cost of sales, cost of compressors and selling, general and administrative expenses.

(2) Includes costs of $74,000 for leases with terms of 12 months or less and $48,000 for leases with terms greater than 12 months.

Schedule of Future Maturities of Lease Liabilities

The following table shows the future maturities of lease liabilities as of March 31, 2020:


Years Ending December 31,	Lease Liabilities
	(in thousands)
2020 (excluding the three months ended March 31, 2020)	$	154
2021	174
2022	47
2023	38
2024	38
Thereafter	168
Total lease payments	619
Less: Imputed interest	(60)
Total	$	559

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

Summary of Option Activity

A summary of all option activity as of December 31, 2019, and changes during the three months ended March 31, 2020 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, 2019	208,334	$	23.67	3.66	$	—
Granted	—	—


Expired	40,000	19.11
Outstanding, March 31, 2020	168,334	$	24.75	4.26	$	—
Exercisable, March 31, 2020	168,334	$	24.75	4.26	$	—

Summary of Stock Options Outstanding

The following table summarizes information about our stock options outstanding at March 31, 2020:


Range of Exercise Prices	Options Outstanding												Options Exercisable
		Shares		Weighted Average Remaining Contractual Life (years)			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price
$0.01-15.70	8,500		1.82		$	14.89		8,500		$	14.89
$15.71-17.81	16,000		0.82		17.81			16,000		17.81
$17.82-20.48	20,500		2.97		18.75			20,500		18.75
$20.49-33.36	123,334		5.09		27.33			123,334		27.33
	168,334		4.26		$	24.75		168,334		$	24.75

Status of Unvested Stock Options

The summary of the status of our unvested stock options as of December 31, 2019 and changes during the three months ended March 31, 2020 is presented below.


Unvested stock options:	Shares	Weighted Average Grant Date Fair Value Per Share
Unvested at December 31, 2019	10,433	$	11.93
Granted	—	—
Vested	(10,433)	11.93
Canceled/Forfeited	—	—
Unvested at March 31, 2020	—	$	—

(Loss) Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table reconciles the numerators and denominators of the basic and diluted (loss) earnings per share computation (in thousands, except per share data):


	Three months ended
	March 31,
	2020		2019
Numerator:
Net income	$	4,082	$	98
Denominator for earnings per basic common share:
Weighted average common shares outstanding	13,157		13,064
Denominator for earnings per diluted common share:
Weighted average common shares outstanding	13,157		13,064
Dilutive effect of stock options and restricted shares	259		204
Diluted weighted average shares	13,416		13,268
Earnings per common share:
Basic	$	0.31	$	0.01
Diluted	$	0.30	$	0.01

Description of Business (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Description of Business (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Capital expenditures	$ 6,700			$ 69,900
Minimum \| Forecast
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Capital expenditures		$ 5,000	$ 12,000
Maximum \| Forecast
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Capital expenditures		$ 7,000	$ 14,000

Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)
Revenue from External Customer [Line Items]
Revenues	$ 17,890,000	$ 17,991,000
Uncertain tax positions	$ 0
Number of operating segments \| segment	1
Bill and Hold Arrangement
Revenue from External Customer [Line Items]
Revenues	$ 852,000,000	$ 2,700,000
Minimum
Revenue from External Customer [Line Items]
Amortization period of capitalized contract costs	1 year
Property and equipment, estimated useful life	3 years
Maximum
Revenue from External Customer [Line Items]
Property and equipment, estimated useful life	39 years
Rental Equipment \| Minimum
Revenue from External Customer [Line Items]
Property and equipment, estimated useful life	15 years
Rental Equipment \| Maximum
Revenue from External Customer [Line Items]
Property and equipment, estimated useful life	25 years

Summary of Significant Accounting Policies (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 1,790	$ 4,604
Add: ASC 842 rental revenue	16,100	13,387
Revenues	17,890	17,991
Compressors - sales
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	852	2,708
Flares - sales
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	80	435
Other (parts/rebuilds) - sales
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	518	982
Service and maintenance
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	340	479
Revenues	$ 340	$ 479

Summary of Significant Accounting Policies (Contract Balances) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Accounts Receivable
Accounts receivable - contracts with customers	$ 1,290	$ 3,061
Accounts receivable - ASC 842	10,168	6,963
Total Accounts Receivable	11,458	10,024
Less: Allowance for doubtful accounts	(939)	(918)
Total Accounts Receivable, net	10,519	9,106
Deferred income	1,190	640
Revenue recognized	$ 73	$ 48

Summary of Significant Accounting Policies (Revised Consolidated Statements of Income) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue:
Revenues	$ 17,890	$ 17,991
Operating costs and expenses:
Cost of rentals, exclusive of depreciation stated separately below	7,897	6,220
Depreciation and amortization	6,240	5,577
Total operating costs and expenses	18,163	18,136
Operating income (loss)	(273)	(145)
Income before provision for income taxes	(461)	156
Income tax (expense) benefit	4,543	(58)
Net income	$ 4,082	$ 98
Basic (in USD per share)	$ 0.31	$ 0.01
Diluted (in USD per share)	$ 0.30	$ 0.01
As Reported
Revenue:
Revenues		$ 17,991
Operating costs and expenses:
Cost of rentals, exclusive of depreciation stated separately below		5,885
Depreciation and amortization		5,558
Total operating costs and expenses		17,782
Operating income (loss)		209
Income before provision for income taxes		510
Income tax (expense) benefit		(153)
Net income		$ 357
Basic (in USD per share)		$ 0.03
Diluted (in USD per share)		$ 0.03
Revisions \| Revision Of Prior Period Financial Statements
Revenue:
Revenues		$ 0
Operating costs and expenses:
Cost of rentals, exclusive of depreciation stated separately below		335
Depreciation and amortization		19
Total operating costs and expenses		354
Operating income (loss)		(354)
Income before provision for income taxes		(354)
Income tax (expense) benefit		95
Net income		$ (259)
Basic (in USD per share)		$ (0.02)
Diluted (in USD per share)		$ (0.02)

Summary of Significant Accounting Policies (Revised Consolidated Statements of Stockholders' Equity) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained earnings, beginning of period	$ 137,478	$ 151,342
Balance, beginning of period	247,693	259,232
Net income	4,082	98
Retained earnings, end of period	141,560	151,440
Balance, end of period	$ 252,129	260,188
As Reported
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained earnings, beginning of period		152,291
Balance, beginning of period		260,181
Net income		357
Retained earnings, end of period		152,648
Balance, end of period		261,396
Revisions \| Revision Of Prior Period Financial Statements
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained earnings, beginning of period		(949)
Balance, beginning of period		(949)
Net income		(259)
Retained earnings, end of period		(1,208)
Balance, end of period		$ (1,208)

- Definition

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

+ References + Details

Summary of Significant Accounting Policies (Revised Consolidated Statements of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 4,082	$ 98
Depreciation and amortization	6,240	5,577
Deferred taxes		68
Inventory (increase) decrease	1,616	(3,986)
Prepaid expenses and prepaid income taxes decrease (increase)	344	149
Net cash (used in) provided by operating activities	8,275	(3,746)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of rental equipment, property and other equipment	(6,679)	(9,230)
Net cash used in investing activities	(6,665)	(9,248)
Net change in cash and cash equivalents	$ 1,459	(12,636)
As Reported
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income		357
Depreciation and amortization		5,558
Deferred taxes		157
Inventory (increase) decrease		(4,468)
Prepaid expenses and prepaid income taxes decrease (increase)		202
Net cash (used in) provided by operating activities		(3,846)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of rental equipment, property and other equipment		(9,130)
Net cash used in investing activities		(9,148)
Net change in cash and cash equivalents		(12,636)
Revisions \| Revision Of Prior Period Financial Statements
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income		(259)
Depreciation and amortization		19
Deferred taxes		(89)
Inventory (increase) decrease		482
Prepaid expenses and prepaid income taxes decrease (increase)		(53)
Net cash (used in) provided by operating activities		100
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of rental equipment, property and other equipment		(100)
Net cash used in investing activities		(100)
Net change in cash and cash equivalents		$ 0

Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Allowance for obsolescence	$ 37	$ 24
Raw materials - current	17,407	19,388
Work-in-process	2,017	1,692
Inventory - current	19,424	21,080
Raw materials - long term (net of allowances of $37 and $24, respectively)	1,108	1,068
Inventory - total	$ 20,532	$ 22,148

Federal Income Tax Receivable (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Federal income tax receivable	$ 14,992		$ 0
Deferred tax liability increase due to tax law change	10,103	$ 0
Income tax benefit from CARES Act	$ 4,900

Rental Equipment (Schedule of Rental Equipment, Property and Equipment) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ (12,682)	$ (12,847)
Rental Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	385,844	380,090
Accumulated depreciation	(167,998)	(162,348)
Rental equipment, net of accumulated depreciation	217,846	217,742
Rental Equipment \| Compressor units
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	378,366	370,961
Rental Equipment \| Work-in-progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 7,478	$ 9,129

Leases (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
Leases (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Right of use assets-operating leases	$ 559	$ 604
Operating lease, liability	559
Lease costs	122
Short-term lease cost	$ 74
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Right of use assets-operating leases			$ 451
Operating lease, liability			$ 451
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	10 years

Leases (Balance Sheet Impact) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Right of use assets-operating leases	$ 559	$ 604
Current operating leases	187	189
Long-term operating leases	372	$ 415
Total lease liabilities	$ 559
Weighted average remaining lease term in years	2 years 3 months 18 days
Implicit Rate	3.10%

Leases (Cash Flow Impact) (Details) $ in Thousands	3 Months Ended
Leases (Cash Flow Impact) (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Leases [Abstract]
Operating lease cost	$ 122
Short-term lease cost	74
Operating lease, cost	$ 48

Leases (Future Maturities of Lease Liabilities) (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Leases [Abstract]
2020 (excluding the three months ended March 31, 2020)	$ 154
2021	174
2022	47
2023	38
2024	38
Thereafter	168
Total lease payments	619
Less: Imputed interest	(60)
Operating lease, liability	$ 559

Credit Facility (Details) - Revolving Credit Facility	3 Months Ended
Credit Facility (Details) - Revolving Credit Facility	Mar. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items]
Aggregate credit agreement commitment	$ 30,000,000
Potential increase in borrowing capacity	20,000,000
Potential maximum borrowing capacity	$ 50,000,000
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%
Borrowing base amount available	$ 29,500,000
Weighted average interest rate	2.88%
Default trigger, certain defaults of other company indebtedness, amount	$ 50,000
Default trigger, rendering of certain judgments, amount	150,000
Line of credit balance	$ 417,000	$ 417,000
LIBOR Rate
Line of Credit Facility [Line Items]
Reference rate, number of allowable LIBOR-based borrowings outstanding \| loan	3
Variable rate, applicable margin	1.25%
CB Floating Rate
Line of Credit Facility [Line Items]
Variable rate, applicable margin	1.50%
Minimum
Line of Credit Facility [Line Items]
Minimum commitment coverage ratio allowed	2.00
Maximum
Line of Credit Facility [Line Items]
Maximum leverage ratio allowed	2.50

Deferred Compensation Plan (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Postemployment Benefits [Abstract]
Participant's maximum compensation deferral percentage	90.00%
Company owned life insurance	$ 1,300		$ 1,500
Gain (loss) on company owned life insurance	(262)	$ 99
Deferred compensation obligation	$ 1,400		$ 1,700
Deferred restricted stock shares (in shares)	36,500	63,062
Deferred compensation arrangement with individual, shares issued (in shares)	138,252	78,771
Deferred compensation arrangement, fair value of shares issued	$ 2,200	$ 1,700

Stock-Based Compensation (Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Number ofStock Options
Outstanding, beginning of period (in shares)	208,334
Granted (in shares)	0
Expired (in shares)	40,000
Outstanding, end of period (in shares)	168,334	208,334
Exercisable (in shares)	168,334
Weighted AverageExercise Price
Outstanding, beginning of period (in USD per share)	$ 23.67
Granted (in USD per share)	0
Expired (in USD per share)	19.11
Outstanding, end of period (in USD per share)	24.75	$ 23.67
Exercisable (in USD per share)	$ 24.75
Weighted Average Remaining Contractual Life (years)
Outstanding	4 years 3 months 3 days	3 years 7 months 28 days
Exercisable	4 years 3 months 3 days
Aggregate Intrinsic Value (in thousands)
Outstanding, beginning of period	$ 0
Outstanding, end of period	0	$ 0
Exercisable	$ 0

Stock-Based Compensation (Stock Options Outstanding) (Details)	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, shares (in shares) \| shares	168,334
Options outstanding, weighted average remaining contractual life (years)	4 years 3 months 3 days
Options outstanding, weighted average exercise price (in USD per share)	$ 24.75
Options exercisable, shares (in shares) \| shares	168,334
Options exercisable, weighted average exercise price (in USD per share)	$ 24.75
$0.01-15.70
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower limit (in USD per share)	0.01
Range of exercise prices, upper limit (in USD per share)	$ 15.70
Options outstanding, shares (in shares) \| shares	8,500
Options outstanding, weighted average remaining contractual life (years)	1 year 9 months 25 days
Options outstanding, weighted average exercise price (in USD per share)	$ 14.89
Options exercisable, shares (in shares) \| shares	8,500
Options exercisable, weighted average exercise price (in USD per share)	$ 14.89
$15.71-17.81
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower limit (in USD per share)	15.71
Range of exercise prices, upper limit (in USD per share)	$ 17.81
Options outstanding, shares (in shares) \| shares	16,000
Options outstanding, weighted average remaining contractual life (years)	9 months 25 days
Options outstanding, weighted average exercise price (in USD per share)	$ 17.81
Options exercisable, shares (in shares) \| shares	16,000
Options exercisable, weighted average exercise price (in USD per share)	$ 17.81
$17.82-20.48
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower limit (in USD per share)	17.82
Range of exercise prices, upper limit (in USD per share)	$ 20.48
Options outstanding, shares (in shares) \| shares	20,500
Options outstanding, weighted average remaining contractual life (years)	2 years 11 months 19 days
Options outstanding, weighted average exercise price (in USD per share)	$ 18.75
Options exercisable, shares (in shares) \| shares	20,500
Options exercisable, weighted average exercise price (in USD per share)	$ 18.75
$20.49-33.36
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower limit (in USD per share)	20.49
Range of exercise prices, upper limit (in USD per share)	$ 33.36
Options outstanding, shares (in shares) \| shares	123,334
Options outstanding, weighted average remaining contractual life (years)	5 years 1 month 2 days
Options outstanding, weighted average exercise price (in USD per share)	$ 27.33
Options exercisable, shares (in shares) \| shares	123,334
Options exercisable, weighted average exercise price (in USD per share)	$ 27.33

Stock-Based Compensation (Summary of Unvested Stock Options) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Shares
Unvested, beginning of period (in shares)	10,433
Granted (in shares)	0
Vested (in shares)	(10,433)
Canceled/Forfeited (in shares)	0
Unvested, end of period (in shares)	0
Weighted Average Grant Date Fair Value Per Share
Unvested, weighted average grant date fair value, beginning of period (in USD per share)	$ 11.93
Granted, weighted average grant date fair value (in USD per share)	0
Vested, weighted average grant date fair value (in USD per share)	11.93
Canceled/Forfeited, weighted average grant date fair value (in USD per share)	0
Unvested, weighted average grant date fair value, end of period (in USD per share)	$ 0
Stock Options
Weighted Average Grant Date Fair Value Per Share
Unrecognized compensation cost related to unvested options	$ 0
Share-based compensation expense	$ 17,000	$ 31,000

Stock-Based Compensation (Restricted Stock) (Details) - Restricted Stock - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 0.5	$ 0.5
Total unrecognized compensation expense	$ 2.8
Unrecognized compensation cost related to awards, vesting period	2 years
Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year

(Loss) Earnings per Share (Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income	$ 4,082	$ 98
Denominator for earnings per basic common share:
Weighted average common shares outstanding (in shares)	13,157,000	13,064,000
Denominator for earnings per diluted common share:
Dilutive effect of stock options and restricted stock (in shares)	259,000	204,000
Diluted weighted average shares (in shares)	13,416,000	13,268,000
Earnings per common share:
Basic (in USD per share)	$ 0.31	$ 0.01
Diluted (in USD per share)	$ 0.30	$ 0.01
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of shares not included in the computation of dilutive income (loss) per share (in shares)	182,839	176,523
Antidilutive Effect
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price of shares not included in the computation of dilutive income (loss) per share, lower limit (in USD per share)	$ 14.89	$ 18.75
Exercise price of shares not included in the computation of dilutive income (loss) per share, upper limit (in USD per share)	$ 33.36	$ 33.36

Related Party (Details) - Corporate Joint Venture - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2016
Related Party Transaction [Line Items]
Purchases from joint venture	$ 1.0
N-G, LLC
Related Party Transaction [Line Items]
Percent ownership		50.00%
Genis Holdings, LLC \| N-G, LLC
Related Party Transaction [Line Items]
Percent ownership		50.00%

Commitments and Contingencies (Details) $ in Millions	Dec. 31, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Contractual obligation	$ 375.0

Subsequent Events (Details) $ in Millions	Apr. 10, 2020 USD ($)
Subsequent Event \| Paycheck Protection Program Loan \| Unsecured Loan
Subsequent Event [Line Items]
Proceeds from entering into loan	$ 4.6