10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2021

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from ______  to ______

Commission File Number 1-31398

NATURAL GAS SERVICES GROUP, INC.

(Exact name of registrant as specified in its charter)

Colorado	75-2811855
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

404 Veterans Airpark Ln., Ste 300

Midland, Texas 79705

(Address of principal executive offices)

(432) 262-2700

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:
Title of each class	Trading Symbol	Name of each exchange on which registered
Common Stock, Par Value $0.01	NGS	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes   x No   o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Yes   x No   o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.  See the definitions of “large accelerated filer”, “accelerated filer”, and “smaller reporting company” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer o Accelerated filer  o Non-accelerated filer ☒ Smaller reporting company ☒ Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes ☐ No x

As of November 8, 2021, there were 13,038,719 shares of the Registrant's common stock, $0.01 par value, outstanding.

Part I - FINANCIAL INFORMATION
Item 1. Consolidated Financial Statements
Unaudited Condensed Consolidated Balance Sheets	Page	1
Unaudited Condensed Consolidated Statements of Operations	Page	2
Unaudited Condensed Consolidated Statements of Stockholders' Equity	Page	3
Unaudited Condensed Consolidated Statements of Cash Flows	Page	5
Notes to Unaudited Condensed Consolidated Financial Statements	Page	6
Item 2.  Management's Discussion and Analysis of Financial Condition and Results of Operations	Page	15
Item 3.  Quantitative and Qualitative Disclosures about Market Risk	Page	22
Item 4.  Controls and Procedures	Page	22
Part II - OTHER INFORMATION
Item 1.  Legal Proceedings	Page	22
Item 1A.  Risk Factors	Page	22
Item 2. Unregistered Sales of Equity Securities	Page	23
Item 3. Defaults Upon Senior Securities	Page	23
Item 4. Mine Safety Disclosures	Page	23
Item 5. Other Information	Page	23
Item 6.  Exhibits	Page	24
Signatures	Page	25

PART I – FINANCIAL INFORMATION

Item 1.  Financial Statements

NATURAL GAS SERVICES GROUP, INC. CONDENSED CONSOLIDATED BALANCE SHEETS (in thousands, except par value) (unaudited)
	September 30,		December 31,
	2021		2020
ASSETS
Current Assets:
Cash and cash equivalents	$	24,424	$	28,925
Trade accounts receivable, net of allowance for doubtful accounts of $1,150 and $1,161, respectively	11,594		11,884
Inventory	21,392		19,926
Federal income tax receivable	11,538		11,538
Prepaid income taxes	33		66
Prepaid expenses and other	668		379
Total current assets	69,649		72,718
Long-term inventory, net of allowance for obsolescence of $37 and $221, respectively	1,250		1,065
Rental equipment, net of accumulated depreciation of $192,827 and $175,802, respectively	208,396		207,585
Property and equipment, net of accumulated depreciation of $15,293 and $13,916, respectively	21,120		21,749
Right of use assets - operating leases, net of accumulated amortization of $519 and $356, respectively	321		483
Intangibles, net of accumulated amortization of $2,102 and $2,008, respectively	1,057		1,151
Other assets	2,513		2,050
Total assets	$	304,306	$	306,801
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
Accounts payable	$	1,120	$	2,373
Accrued liabilities	13,621		6,770
Line of credit	—		417
Current operating leases	94		198
Deferred income	693		1,103
Total current liabilities	15,528		10,861
Deferred income tax liability	41,448		41,890
Long-term operating leases	227		285
Other long-term liabilities	2,578		2,221
Total liabilities	59,781		55,257
Commitments and contingencies (Notes 6 and 9)
Stockholders’ Equity:
Preferred stock, 5,000 shares authorized, no shares issued or outstanding	—		—
Common stock, 30,000 shares authorized, par value $0.01; 13,394 and 13,296 shares issued, respectively	134		133
Additional paid-in capital	113,596		112,615
Retained earnings	135,717		139,286
Treasury Shares, at cost, 471 and 38 shares, respectively	(4,922)		(490)
Total stockholders' equity	244,525		251,544
Total liabilities and stockholders' equity	$	304,306	$	306,801

See accompanying notes to these unaudited condensed consolidated financial statements.

1

NATURAL GAS SERVICES GROUP, INC. CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (in thousands, except earnings per share) (unaudited)
	Three months ended				Nine months ended
	September 30,				September 30,
	2021		2020		2021		2020
Revenue:
Rental income	$	16,195	$	14,861	$	47,149	$	46,092
Sales	1,472		536		5,756		3,994
Service and maintenance income	578		368		1,486		974
Total revenue	18,245		15,765		54,391		51,060
Operating costs and expenses:
Cost of rentals, exclusive of depreciation stated separately below	8,826		6,760		25,065		21,286
Cost of sales, exclusive of depreciation stated separately below	1,563		997		5,955		4,596
Cost of service and maintenance, exclusive of depreciation stated separately below	327		138		625		363
Selling, general and administrative expenses	2,705		2,493		7,960		7,318
Depreciation and amortization	6,387		6,318		19,010		18,859
Total operating costs and expenses	19,808		16,706		58,615		52,422
Operating loss	(1,563)		(941)		(4,224)		(1,362)
Other income (expense):
Interest expense	(25)		(2)		(40)		(13)
Other income, net	119		214		270		407
Total other income (expense), net	94		212		230		394
Loss before provision for income taxes	(1,469)		(729)		(3,994)		(968)
Income tax benefit	212		167		425		4,653
Net (loss) income	$	(1,257)	$	(562)	$	(3,569)	$	3,685
(Loss) earnings per share:
Basic	$	(0.10)	$	(0.04)	$	(0.27)	$	0.28
Diluted	$	(0.10)	$	(0.04)	$	(0.27)	$	0.27
Weighted average shares outstanding:
Basic	13,121		13,248		13,225		13,214
Diluted	13,121		13,248		13,225		13,471

See accompanying notes to these unaudited condensed consolidated financial statements.

2

NATURAL GAS SERVICES GROUP, INC. CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (in thousands) (unaudited)
	Preferred Stock			Common Stock			Additional Paid-In Capital		Retained Earnings		Treasury Stock			Total Stockholders' Equity
	Shares	Amount		Shares	Amount						Shares	Amount
BALANCES, January 1, 2020	—	$	—	13,178	$	132	$	110,573	$	137,478	38	$	(490)	$	247,693
Compensation expense on common stock options	—	—		—	—		17		—		—	—		17
Issuance of restricted stock	—	—		95	—		—		—		—	—		—
Compensation expense on restricted common stock	—	—		—	1		485		—		—	—		486
Taxes paid related to net shares settlement of equity awards	—	—		—	—		(149)		—		—	—		(149)
Net income	—	—		—	—		—		4,082		—	—		4,082
BALANCES, March 31, 2020	—	—		13,273	133		110,926		141,560		38	(490)		252,129
Compensation expense on common stock options	—	—		—	—		1		—		—	—		1
Issuance of restricted stock	—	—		13	—		—		—		—	—		—
Compensation expense on restricted common stock	—	—		—	—		562		—		—	—		562
Net income	—	—		—	—		—		165		—	—		165
BALANCES, June 30, 2020	—	—		13,286	133		111,489		141,725		38	(490)		252,857
Compensation expense on common stock options	—	—		—	—		1		—		—	—		1
Issuance of restricted stock	—	—		4	—		—		—		—	—		—
Compensation expense on restricted common stock	—	—		—	—		562		—		—	—		562
Net loss	—	—		—	—		—		(562)		—	—		(562)
BALANCES, September 30, 2020	—	$	—	13,290	$	133	$	112,052	$	141,163	38	$	(490)	$	252,858

3

NATURAL GAS SERVICES GROUP, INC. CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (in thousands) (unaudited)
	Preferred Stock			Common Stock			Additional Paid-In Capital		Retained Earnings		Treasury Stock			Total Stockholders' Equity
	Shares	Amount		Shares	Amount						Shares	Amount
BALANCES, January 1, 2021	—	$	—	13,296	$	133	$	112,615	$	139,286	38	$	(490)	$	251,544
Issuance of restricted stock	—	—		62	—		—		—		—	—		—
Compensation expense on restricted common stock	—	—		—	1		473		—		—	—		474
Taxes paid related to net shares settlement of equity awards	—	—		—	—		(224)		—		—	—		(224)
Net loss	—	—		—	—		—		(394)		—	—		(394)
BALANCES, March 31, 2021	—	—		13,358	134		112,864		138,892		38	(490)		251,400
Issuance of restricted stock	—	—		36	—		—		—		—	—		—
Compensation expense on restricted common stock	—	—		—	—		421		—		—	—		421
Taxes paid related to net shares settlement of equity awards	—	—		—	—		(110)		—		—	—		(110)
Purchase of treasury shares	—	—		—	—		—		—		175	(1,892)		(1,892)
Net loss	—	—		—	—		—		(1,918)		—	—		(1,918)
BALANCES, June 30, 2021	—	—		13,394	134		113,175		136,974		213	(2,382)		247,901
Compensation expense on restricted common stock	—	—		—	—		421		—		—	—		421
Purchase of treasury shares	—	—		—	—		—		—		258	(2,540)		(2,540)
Net loss	—	—		—	—		—		(1,257)		—	—		(1,257)
BALANCES, September 30, 2021	—	$	—	13,394	$	134	$	113,596	$	135,717	471	$	(4,922)	$	244,525

See accompanying notes to these unaudited condensed consolidated financial statements.

4

NATURAL GAS SERVICES GROUP, INC. CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (in thousands) (unaudited)
	Nine months ended
	September 30,
	2021		2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$	(3,569)	$	3,685
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	19,010		18,859
Amortization of debt issuance costs	18		—
Deferred income taxes	(442)		233
Stock-based compensation	1,316		1,628
Bad debt allowance	65		287
Gain on sale of assets	(127)		(284)
Loss (gain) on company owned life insurance	(162)		19
Changes in operating assets and liabilities:
Trade accounts receivables	225		(1,565)
Inventory	(1,682)		3,793
Federal income tax receivable	—		(11,083)
Prepaid expenses and prepaid income taxes	(256)		(86)
Accounts payable and accrued liabilities	5,599		2,174
Deferred income	(410)		(57)
Deferred tax liability increase due to tax law change	—		10,103
Other	373		226
NET CASH PROVIDED BY OPERATING ACTIVITIES	19,958		27,932
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of rental equipment, property and other equipment	(19,080)		(11,964)
Purchase of company owned life insurance	(98)		(254)
Proceeds from sale of property and equipment	141		394
Proceeds from sale of deferred compensation mutual fund	—		10
NET CASH USED IN INVESTING ACTIVITIES	(19,037)		(11,814)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from loan	—		4,601
Repayment of loan	—		(4,601)
Payments of other long-term liabilities, net	(1)		(2)
Payments of debt issuance costs	(237)		—
Repayments of line of credit, net	(417)		—
Purchase of treasury shares	(4,432)		—
Taxes paid related to net share settlement of equity awards	(335)		(149)
NET CASH USED IN FINANCING ACTIVITIES	(5,422)		(151)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(4,501)		15,967
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	28,925		11,592
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	24,424	$	27,559
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid	$	25	$	13
Income taxes paid	$	—	$	95
NON-CASH TRANSACTIONS
Right of use asset acquired through an operating lease	$	—	$	52

See accompanying notes to these unaudited condensed consolidated financial statements.

5

Natural Gas Services Group, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

1. 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.

2. 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. 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 September 30, 2021 and the results of our operations for the three and nine months ended September 30, 2021 and 2020 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, 2020 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 and nine months ended September 30, 2021 are not necessarily indicative of the results of operations to be expected for the full fiscal year ending December 31, 2021.

Revenue Recognition Policy

The Company recognizes revenue in accordance with ASC 606, Revenue from Contracts with Customers ("ASC 606"), except for rental revenue as discussed below. 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 condensed 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 period. 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, we have applied the practical expedient ASC 842-10-15-42A, which allows the Company to combine lease and non-lease components.

6

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 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 and 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 maintained by the customer and there are no exceptions to the customer’s commitment to accept and pay for the manufactured equipment. There was no revenue recognized for bill and hold arrangements for the nine months ended September 30, 2021. Revenue recognized related to bill and hold arrangements for the nine months ended September 30, 2020 was approximately $852,000.

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.

7

Disaggregation of Revenue

The following table shows the Company's revenue disaggregated by product or service type for the three and nine months ended September 30, 2021 and 2020:

	Three months ended September 30,				Nine months ended September 30,
	2021		2020		2021		2020
	(in thousands)				(in thousands)
Compressors - sales	$	—	$	—	$	1,891	$	2,211
Flares - sales	74		67		149		308
Other (parts/rebuilds) - sales	1,398		469		3,716		1,475
Service and maintenance	578		368		1,486		974
Total revenue from contracts with customers	2,050		904		7,242		4,968
Add: ASC 842 rental revenue	16,195		14,861		47,149		46,092
Total revenue	$	18,245	$	15,765	$	54,391	$	51,060

Contract Balances

As of September 30, 2021 and December 31, 2020, we had the following receivables and deferred income from contracts with customers:

	September 30, 2021		December 31, 2020
	(in thousands)
Accounts Receivable
Accounts receivable - contracts with customers	$	3,359	$	3,243
Accounts receivable - ASC 842	9,385		9,802
Total Accounts Receivable	$	12,744	$	13,045
Less: Allowance for doubtful accounts	(1,150)		(1,161)
Total Accounts Receivable, net	$	11,594	$	11,884
Deferred income	$	693	$	1,103

The Company recognized sales and rental revenues of $1.1 million and $2,000, respectively, for the nine months ended September 30, 2021 that was included in deferred income at the beginning of 2021. For the year ended December 31, 2020, the Company recognized sales and rental revenues of $533,000 and $73,000, respectively, that was included in deferred income at the beginning of 2020.

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

Remaining Performance Obligations

As of September 30, 2021, 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.

8

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. Valuation allowances are established to reduce deferred tax assets when it is more likely than not that some portion or all of the deferred tax assets will not be realized. 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.

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. Tax benefits are recognized only for tax positions that are more likely than not to be sustained upon examination by tax authorities. The amount recognized is measured as the largest amount of benefit that is greater than 50% likely to be realized upon settlement. A liability for unrecognized tax benefits is recorded for any tax benefits claimed in our tax returns that do not meet these recognition and measurement standards. We have no liabilities for uncertain tax positions as of September 30, 2021.

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

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act") was enacted in response to the economic impact caused by 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 see Note 4, Federal Income Tax Receivable for a discussion about the impact on our condensed consolidated financial statements.

Recently Issued Accounting Pronouncements

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.

3. Inventory

Our inventory, net of allowance for obsolescence of $37,000 at September 30, 2021 and $221,000 at December 31, 2020, consisted of the following amounts:

	September 30, 2021		December 31, 2020
	(in thousands)
Raw materials - current	$	20,381	$	18,026
Work-in-process	1,011		1,900
Inventory - current	21,392		19,926
Raw materials - long term (net of allowances of $37 and $221, respectively)	1,250		1,065
Inventory - total	$	22,642	$	20,991

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.

Inventory Allowance

We routinely review our inventory allowance balance to account for slow moving or obsolete inventory costs that may not be recoverable in the future.

9

A summary of our inventory allowance is as follows:

	September 30, 2021		December 31, 2020
	(in thousands)
Beginning balance	$	(221)	$	(24)
Accruals	—		(251)
Write-offs	184		54
Ending balance	$	(37)	$	(221)

4. Federal Income Tax Receivable

As 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 has filed amended returns to carryback these losses for five years. Accordingly, during 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. During the third quarter of 2020, the Company received refunds totaling $3.9 million related to its 2018 NOLs, which reduced its federal income tax receivable to $11.5 million on its condensed consolidated balance sheet as of September 30, 2021.

5. Rental Equipment

Our rental equipment and associated accumulated depreciation as of September 30, 2021 and December 31, 2020, respectively, consisted of the following:

	September 30, 2021		December 31, 2020
	(in thousands)
Compressor units	$	397,426	$	379,623
Work-in-process	3,797		3,764
Rental equipment	401,223		383,387
Accumulated depreciation	(192,827)		(175,802)
Rental equipment, net of accumulated depreciation	$	208,396	$	207,585

We evaluated our rental equipment for potential impairment as of September 30, 2021, and determined that no such impairment existed as of that date.

6. Credit Facility

Previous Credit Agreement

We had a senior secured revolving credit agreement the ("Previous Credit Agreement") with JP Morgan Chase Bank, N.A (the "Lender") that matured on March 31, 2021. Prior to maturation, the outstanding balance of $417,000 was repaid. The Previous Credit Agreement had an aggregate commitment of $30 million, subject to collateral availability.

New Credit Agreement

On May 11, 2021, we entered into a five year senior secured revolving credit agreement ("New Credit Agreement") with Texas Capital Bank, National Association (the "Lender") with an initial commitment of $20 million and an accordion feature that would increase the maximum commitment to $30 million, subject to collateral availability. We also have a right to request from the Lender, on an uncommitted basis, an increase of up to $30 million on the aggregate commitment; provided, however, the aggregate commitment amount is not permitted to exceed $50 million. The maturity date of the New Credit Agreement is May 11, 2026. The obligations under the New Credit Agreement are secured by a first priority lien on a variety of our assets, including inventory and accounts receivable as well as a variable number of our leased compressor equipment.

Borrowing Base. At any time before the maturity of the New 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) 90% of eligible accounts receivable owed to the Company by investment grade debtors, plus (b) 85% of the eligible accounts receivable owing by non-investment grade debtors, plus (c) 50% of the eligible inventory,

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valued at the lower of cost or market value at such time, subject to a cap of this component not to exceed $2.0 million, plus (d) the lesser of (i) 95% of the net book value of the compressors that the Lender has determined are eligible for the extension of credit, valued at the lower of cost or market value with depreciation not to exceed 25 years, at such time and (ii) 80% of the net liquidation value percentage of the net book value of the eligible compressors that the Lender has determined are eligible for the extension of credit, valued at the lower of cost or market value with depreciation not to exceed 25 years, at such time, plus (e) 80% of the value at cost (excluding any costs for capitalized interest or other non-cash capitalized costs) of the eligible new compressor fleet, minus (f) any required availability reserves determined by the Lender in its sole discretion. The Lender may adjust the borrowing base components if material deviations in the collateral are discovered in future audits of the collateral. As of September 30, 2021, our allowable borrowing base was $20.0 million.

Interest and Fees. Under the terms of the New Credit Agreement, we have the option of selecting the applicable variable rate for each revolving loan, or portion thereof, of either (a) the Base Rate (as defined below) plus the Applicable Margin, or (b) in the case of a Eurodollar Rate Loan, the Adjusted Eurodollar Rate plus the Applicable Margin. "Base Rate" means, for any day, a rate of interest per annum equal to the highest of (a) the prime rate for such day; (b) the sum of the federal funds rate for such day plus 0.50%; and (c) the Adjusted Eurodollar Rate for such day plus 1.00%. The Applicable Margin is determined based upon the leverage ratio as set forth in the most recent compliance certificate received by the Lender for each fiscal quarter from time to time pursuant to the New Credit Agreement. Depending on the leverage ratio, the Applicable Margin can be 0.25% to 0.75% for Base Rate Loans (as defined in the New Credit Agreement) and 1.25% to 1.75% for Eurodollar Rate Loans and for requested letters of credit. In addition, we are required to pay a monthly commitment fee on the daily average unused amount of the commitment while the New Credit Agreement is in effect at an annual rate equal to 0.25% of the unused commitment amount. Accrued interest is payable monthly on outstanding principal amounts and unused commitment fee, provided that accrued interest on Eurodollar Rate Loans is payable at the end of each interest period, but in no event less frequently than quarterly.

Covenants. The New Credit Agreement contains customary representations and warranties, as well as covenants which, among other things, condition or 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 are applicable during certain trigger periods specified in the Credit Agreement and require us during such trigger periods to maintain a leverage ratio less than or equal to 3.00 to 1.00 as of the last day of each fiscal quarter and a fixed charge coverage ratio greater than or equal to 1.00 to 1.00 as of the last day of each fiscal quarter.

Events of Default and Acceleration. The New 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 Credit Agreement and the other transaction 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 $1.0 million; certain bankruptcy or insolvency events; the rendering of certain judgments in excess of $1.0 million; certain ERISA events; certain change in control events and the defectiveness of any liens under the secured revolving credit agreement. Obligations outstanding under the Credit Agreement may be accelerated upon the occurrence of an event of default.

As of September 30, 2021, we were in compliance with all financial covenants in our New Credit Agreement. At September 30, 2021, we had no amounts outstanding under the New Credit Agreement.

7. Stock-Based and Other Long-Term Incentive Compensation

Stock Options

A summary of all option activity as of December 31, 2020, and changes during the nine months ended September 30, 2021 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, 2020	161,334	$	24.48	3.48	$	—
Granted	—	—		—	—
Cancelled / Forfeited	—	—		—	—
Expired	(16,000)	17.81		—	—
Outstanding, September 30, 2021	145,334	$	25.21	3.11	$	—
Exercisable, September 30, 2021	145,334	$	25.21	3.11	$	—

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The following table summarizes information about our stock options outstanding at September 30, 2021:

Range of Exercise Prices	Options Outstanding				Options Exercisable
	Shares	Weighted Average Remaining Contractual Life (years)	Weighted Average Exercise Price		Shares	Weighted Average Exercise Price
$0.01-18.00	8,500	0.32	$	14.89	8,500	$	14.89
$18.01-22.00	20,500	1.47	18.75		20,500	18.75
$22.01-26.00	42,167	3.53	22.90		42,167	22.90
$26.01-30.00	30,000	5.38	28.15		30,000	28.15
$30.01-34.00	44,167	2.47	30.41		44,167	30.41
	145,334	3.11	$	25.21	145,334	$	25.21

As of September 30, 2021 and December 31, 2020, there were no unvested stock options.

As of September 30, 2021, there was no unrecognized compensation cost related to unvested options. For the nine months ended September 30, 2021 there was no compensation expense for stock options. For the nine months ended September 30, 2020, total compensation expense for stock options was $18,000.

Restricted Shares/Units

In accordance with the Company's employment agreement with Stephen Taylor, the Company's Chief Executive Officer, the Compensation Committee of the Company's Board of Directors reviewed his performance in determining the issuance of restricted common stock. Based on this review, which included consideration of the Company's 2020 performance, Mr. Taylor was awarded 109,212 restricted shares on March 18, 2021, which vest over three years, in equal annual installments, beginning March 18, 2022. On March 18, 2021, the Compensation Committee awarded 20,000 restricted shares to our Vice President of Technical Services, James Hazlett. The restricted shares to Mr. Hazlett vest over three years, in equal annual installments, beginning March 18, 2022. On June 17, 2021, the Compensation Committee awarded 5,000 restricted shares to our Vice President and Chief Financial Officer, Micah C. Foster. The restricted shares granted to Mr. Foster vest over 3 years, in equal annual installments, beginning on June 17, 2022. On March 18, 2021, we also awarded and issued 5,612 shares of restricted common stock to each of our three independent members of our Board of Directors as partial payment for their services in 2021. On April 1, 2021, we awarded and issued 5,291 shares of restricted common stock to a newly appointed member of our Board of Directors as partial payment for his services in 2021. These awards of restricted stock vest one year from the date of grant. Total compensation expense related to these and previously granted restricted stock awards was $1.3 million and $1.7 million for the nine months ended September 30, 2021 and 2020, respectively. As of September 30, 2021, there was a total of $1.8 million of unrecognized compensation expense related to these shares/units which is expected to be recognized over the next 1.7 years.

A summary of all restricted stock/units outstanding as of December 31, 2020 and activity during the nine months ended September 30, 2021 is presented below:

	Number  of Shares	Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2020	258,101	$	12.87	1.61	$	2,447
Granted	156,339	8.93			1,406
Vested	(134,788)	14.94			1,258
Canceled/Forfeited	(3,333)	12.26			31
Outstanding, September 30, 2021	276,319	$	9.63	2.03	$	2,868

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Other Long-Term Incentive Compensation

On April 28, 2020, based on its review of Mr. Taylor's 2019 performance, the Compensation Committee issued a long-term incentive award of $1.1 million to Mr. Taylor that vests in equal, annual tranches over 3 years beginning on the anniversary of the grant date. At the time of vesting, each tranche was or will be payable in cash or common stock at the discretion of the Compensation Committee. On March 18, 2021, based on its review of Mr. Taylor's 2020 performance, the Compensation Committee issued a long-term incentive award of $973,080 to Mr. Taylor that vests in equal, annual tranches over 3 years beginning on the anniversary of the grant date. In addition, on April 28, 2020, we issued a $50,000 award to three of our independent members of our Board of Directors as partial payment for their services in 2020. These awards vest one year from the date of grant and are payable in cash upon vesting. On March 18, 2021, we issued a $50,000 award to three of our independent members of our Board of Directors as partial payment for their services in 2021. On April 1, 2021, we issued a $50,000 award to a newly appointed independent member of our Board of Directors as partial payment for his services in 2021. These awards vest one year from the date of grant and are payable in cash upon vesting. The Company accounts for these other long-term incentive awards to Mr. Taylor and our independent Board members as liabilities under accrued liabilities on our condensed consolidated balance sheet. The vesting of these awards awards is subject to acceleration upon certain events, such as (i) death or disability of the recipient, (ii) certain circumstances in connection with a change of control of the Company, (iii) for executive officers, termination without cause (as defined in the agreement), and (iv) for executive officers, resignation for good reason (as defined). Total compensation expense related to these other long-term incentive awards was approximately $600,000 and $252,000 for the nine months ended September 30, 2021 and 2020, respectively. As of September 30, 2021, there was a total of $1.4 million of unrecognized compensation expense related to these other long-term incentive awards which is expected to be recognized over the next 2.0 years.

8. (Loss) Earnings per Share

The following table reconciles the numerators and denominators of the basic and diluted (loss) earnings per share computation:

	Three months ended				Nine months ended
	September 30,				September 30,
	2021		2020		2021		2020
	(in thousands, except per share data)
Numerator:
Net (loss) income	$	(1,257)	$	(562)	$	(3,569)	$	3,685
Denominator for (loss) earnings per basic common share:
Weighted average common shares outstanding	13,121		13,248		13,225		13,214
Denominator for (loss) earnings per diluted common share:
Weighted average common shares outstanding	13,121		13,248		13,225		13,214
Dilutive effect of stock options and restricted stock/units	—		—		—		257
Diluted weighted average shares	13,121		13,248		13,225		13,471
(Loss) earnings per common share:
Basic	$	(0.10)	$	(0.04)	$	(0.27)	$	0.28
Diluted	$	(0.10)	$	(0.04)	$	(0.27)	$	0.27

For the three and nine months ended September 30, 2021, 276,319 restricted stock/units and 145,334 stock options were not included in the computation of diluted loss per share due to their antidilutive effect.

For the three months ended September 30, 2020, 262,781 restricted stock/units and 166,334 stock options were not included in the computation of diluted earnings per share due to their antidilutive effect. For the nine months ended September 30, 2020, 10,774 restricted stock/units and 171,900 stock options were not included in the computation of diluted earnings per share due to their antidilutive effect.

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9.  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.

Stock Repurchase Program

On August 12, 2019, the Company announced the Board of Directors had authorized the repurchase of up to $10.0 million of its outstanding shares of common stock in the open market, block trades or privately negotiated transactions. The timing and extent of any repurchase is subject to the discretion of management and is dependent upon market pricing and conditions, business, legal, accounting and other considerations. The repurchase program does not obligate the Company to purchase any shares and was set to expire on September 30, 2020, subject to earlier termination of the program by the Board of Directors. On October 23, 2020, the Board of Directors authorized the extension of the repurchase program through September 30, 2021. The repurchase program may be modified, suspended or terminated at any time without notice, in the Company’s discretion, based upon a number of factors, including market conditions, the cost of repurchasing shares, the availability of alternative investment opportunities, liquidity, the need for capital in the Company’s operations and other factors deemed appropriate. The Company intends to finance the repurchases with existing liquidity and free cash flow. For the nine months ended September 30, 2021, the Company repurchased 432,731 of its outstanding shares of common stock with a value of $4.4 million, at an average price of $10.24. As of September 30, 2021, the expiration date of the plan, the Company had repurchased 470,667 of its outstanding shares of common stock with a value of $4.9 million, at an average price of $10.46. On September 30, 2021, the Board of Directors authorized a new repurchase plan for up to $10.0 million of its outstanding shares of common stock in the open market, block trades or privately negotiated transactions. The terms of the new plan remain unchanged from the terms of the plan that expired on September 30, 2021. For further information, see Part II Item 2 - Unregistered Sales of Equity Securities and Use of Proceeds.

10.  Subsequent Events

None.

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Item 2.   Management’s Discussion and Analysis of Financial Condition and Results of Operations

The discussion and analysis of our financial condition and results of operations are based on, and should be read in conjunction with, our condensed consolidated financial statements and the related notes included elsewhere in this report and  in our Annual Report on Form 10-K for the year ended December 31, 2020 filed with the SEC.

This report and our Annual Report on Form 10-K contain certain forward-looking statements, within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, as amended, and information pertaining to us, our industry and the oil and natural gas industry that is based on the beliefs of our management, as well as assumptions made by and information currently available to our management. All statements, other than statements of historical facts contained in this report as well as our Annual Report on Form 10-K, including statements regarding our future financial position, growth strategy, budgets, projected costs, plans and objectives of management for future operations, are forward-looking statements. We use the words “may,” “will,” “expect,” “anticipate,” “estimate,” “believe,” “continue,” “intend,” “plan,” “budget” and other similar words to identify forward-looking statements. You should read statements that contain these words carefully and should not place undue reliance on these statements because they discuss future expectations, contain projections of results of operations or of our financial condition and/or state other “forward-looking” information. We do not undertake any obligation to update or revise publicly any forward-looking statements. Although we believe our expectations reflected in these forward-looking statements are based on reasonable assumptions, no assurance can be given that these expectations or assumptions will prove to have been correct.

Please read Item 1A, Risk Factors, in our Annual Report on Form 10-K for the year ended December 31, 2020, as it contains important factors that could cause actual results to differ materially from the expectations reflected in the forward-looking statements.

Overview

We fabricate, manufacture, rent, and sell natural gas compressors and related equipment. Our primary focus is on the rental of natural gas compressors. Our rental contracts typically provide for initial terms of six to 24 months, with our larger horsepower units having contract terms of up to 60 months. After the initial term of our rental contracts, many of our customers have continued to rent our compressors on a month-to-month basis. Rental amounts are billed monthly in advance and include maintenance of our rented compressors. As of September 30, 2021, we had 1,221 natural gas compressors totaling 288,706 horsepower rented to 78 customers compared to 1,278 natural gas compressors totaling 286,488 horsepower rented to 82 customers at September 30, 2020.

We also fabricate natural gas compressors for sale to our customers, designing compressors to meet unique specifications dictated by well pressures, production characteristics, and particular applications for which compression is sought. Fabrication of compressors involves our purchase of engines, compressors, coolers, and other components, and our assembling of these components on skids for delivery to customer locations. The major components of our compressor packages are acquired through periodic purchase orders placed with third-party suppliers on an “as needed” basis, which presently require lead times between two to three months with delivery dates scheduled to coincide with our estimated production schedules. Although we do not have formal continuing supply contracts with any major supplier, we believe we have adequate alternative sources available. In the past, we have not experienced any sudden and dramatic increases in the prices of the major components for our compressors; however, the occurrence of such an event could have a material adverse effect on the results of our operations and financial condition, particularly if we were unable to increase our rental rates and sales prices proportionate to any such component price increases.

We also manufacture a proprietary line of compressor frames, cylinders and parts, known as our CiP (Cylinder-in-Plane) product line. We use finished CiP component products in the fabrication of compressor units for sale or rental by us or sell the finished component products to other compressor fabricators. We also design, fabricate, sell, install, and service flare stacks and related ignition and control devices for onshore and offshore incineration of gas compounds such as hydrogen sulfide, carbon dioxide, natural gas and liquefied petroleum gases. To provide customer support for our compressor and flare sales businesses, we stock varying levels of replacement parts at our Midland, Texas facility and at field service locations. We also provide an exchange and rebuild program for screw compressors and maintain an inventory of new and used compressors to facilitate this business.

We provide service and maintenance to our customers under written maintenance contracts or on an as-required basis in the absence of a service contract. Maintenance agreements typically have terms of six months to one year and require payment of a monthly fee.

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The oil and natural gas equipment rental and services industry is cyclical in nature. The most critical factor in assessing the outlook for the industry is the worldwide supply and demand for oil and natural gas and the corresponding changes in commodity prices. As demand and prices increase, oil and natural gas producers typically increase their capital expenditures for drilling, development and production activities, although recent equity capital constraints and demands from institutional investors to keep spending within operating cash flow have meaningfully restrained capital expenditure budgets of domestic exploration and production companies. Generally, increased capital expenditures ultimately result in greater revenues and profits for service and equipment companies.

In general, we expect our overall business activity and revenues to track the level of activity in the oil and natural gas industry, with changes in crude oil and condensate production and consumption levels and prices affecting our business more than changes in domestic natural gas production and consumption levels and prices. In recent years we have increased our rentals and sales in unconventional oil shale plays, which are more dependent on crude oil prices. With this shift towards oil production, the demand for overall compression services and products is driven by two general factors: an increased focus by producers on artificial lift applications, e.g., production enhancement with compression assisted gas lift; and declining reservoir pressure in maturing natural gas producing fields, especially unconventional production. These types of applications have historically been serviced by wellhead size compressors, and continue to be, but there has also been an economic move by our customers towards centralized drilling and production facilities, which have increased the market need for larger horsepower compressor packages. We recognized this need in recent years and have been shifting our cash and fabrication resources towards designing, fabricating and renting gas compressor packages that range from 400 horsepower up to 1,380 horsepower. While this is a response to market conditions and trends, it also provides us with the opportunity to compete as a full-line compression provider.

Industry Update

We typically experience a decline in demand during periods of low crude oil and natural gas prices. During the first quarter of 2020, we saw a substantial decline in the prices for oil and natural gas. While commodity prices have stabilized during late 2020 and through the first nine months of 2021, activity levels of exploration and production companies have been and will be dependent not only on commodity prices, but also on their ability to generate sufficient operational cash flow to fund their activities. Generally, though, we feel that production activities (in which we are involved) will fare better than drilling activity. This is reflected in both the stability of our rental revenues, which is driven by production activities, and the volatility of our compressor sales, which tends to fluctuate with drilling activity.

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, resulted in a significant, rapid decline in global and U.S. economic conditions. This significant drop in economic activity caused global demand for crude oil to drastically decline.

While oil and natural gas prices have recovered from these historic lows, we still expect compressor sales to be low for the remainder of 2021, as exploration and production companies have elected to rent compression units rather than allocating capital dollars to purchase new compression.

Finally, in keeping with current commercial precautions and practices in our industry, we have implemented guidelines to mitigate health risks to our employees and customers during this outbreak. 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 our service operations or caused us to incur significant additional costs. In addition, we have not experienced any supply chain issues in connection with the COVID-19 outbreak.

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Results of Operations

Three months ended September 30, 2021, compared to the three months ended September 30, 2020.

The table below shows our revenues and percentage of total revenues of each of our product lines for the three months ended September 30, 2021 and 2020.

	Three months ended September 30,
	2021				2020
	(in thousands)
Rental	$	16,195	88.8	%	$	14,861	94.3	%
Sales	1,472		8.1	%	536		3.4	%
Service and Maintenance	578		3.1	%	368		2.3	%
Total	$	18,245			$	15,765

Total revenue increased 15.7% to $18.2 million for the three months ended September 30, 2021 compared to $15.8 million for the three months ended September 30, 2020. This increase was primarily a result of higher rental revenue (9.0% increase) during 2021 as well as higher sales revenue (175% increase).

Rental revenue increased to $16.2 million for the three months ended September 30, 2021 compared to $14.9 million for the same period in 2020. This increase during the third quarter of 2021 was attributable to higher horsepower compression rentals as these units carry a higher revenue rate than our lower horsepower units.

As of September 30, 2021, we had 2,275 compressor packages in our fleet, down from 2,339 units at September 30, 2020 due to the retirement of 122 units during the fourth quarter of 2020. The Company's total unit horsepower increased to 452,283 horsepower at September 30, 2021 compared to 449,133 horsepower at September 30, 2020, due to the addition to the Company's fleet of 21 high horsepower compressors with 8,400 horsepower over the past 12 months. As of September 30, 2021, we had 1,221 natural gas compressors with a total of 288,706 horsepower rented to 78 customers, compared to 1,278 natural gas compressors with a total of 286,488 horsepower rented to 82 customers as of September 30, 2020. As a result, our total rented horsepower as of September 30, 2021 increased by 0.8% over the last twelve months. Our rental fleet had unit utilization as of September 30, 2021, and 2020, respectively, of 53.7% and 54.6%, and our horsepower utilization for the same period ends remained steady at 63.8%. While our total rented units declined during the period, our total rented horsepower increased by 0.8% contrasted against a 4.5% decline in total rented units. This illustrates the growing demand for our high horsepower units while the demand for our smaller and medium horsepower units has not recovered in line with recent commodity price increases.

Sales revenue increased to $1.5 million for the three months ended September 30, 2021 compared to $536,000 for the three months ended September 30, 2020. This increase is mostly attributable to increased parts sales during the third quarter of 2021 compared to the same period in 2020. Sales are subject to fluctuations in timing of industry activity related to our customers' capital projects and, as such, can vary substantially between periods.

Cost of rentals increased to $8.8 million during the three months ended September 30, 2021 compared to $6.8 million during the three months ended September 30, 2020. While rental revenues increased 9.0%, this 30.6% increase in costs of rentals is primarily due to labor and parts expenses related to a significant increase in repair and maintenance work on our rental fleet as well as increased costs related to newly set units which experience higher upfront costs than typical run rates. While repair and maintenance expenses are customary in our business, the timing of such expenses can fluctuate between periods resulting in periods with larger than normal expenses.

Cost of sales increased 56.8% to $1.6 million during the three months ended September 30, 2021 compared to $1.0 million during the three months ended September 30, 2020. This increase was primarily due to higher parts sales during the period.

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Selling, general, and administrative ("SG&A") expenses increased 8.5% to $2.7 million for the three months ended September 30, 2021 compared $2.5 million during the same period in 2020. This increase in SG&A expenses was primarily attributable to an increase in estimated executive bonus compensation expense and increased health insurance costs partially offset by decreased stock compensation expenses.

Depreciation and amortization expense increased marginally to $6.4 million for the three months ended September 30, 2021 compared to $6.3 million for the three months ended September 30, 2020.  This was the result of larger horsepower units being added to the fleet partially offset by unit retirements in the fourth quarter of 2020.

We recorded an income tax benefit of approximately $212,000 for the three months ended September 30, 2021 compared to an income tax benefit of $167,000 for the three months ended September 30, 2020. For interim periods, our income tax benefit (expense) is computed based upon our estimated annual effective tax rate and any discrete items that impact the interim periods. Our estimated annual effective tax rate differs from the U.S. federal statutory rate of 21%.

Nine months ended September 30, 2021, compared to the nine months ended September 30, 2020.

The table below shows our revenues and percentage of total revenues of each of our product lines for the nine months ended September 30, 2021 and 2020.

	Nine months ended September 30,
	2021				2020
	(in thousands)
Rental	$	47,149	86.7	%	$	46,092	90.3	%
Sales	5,756		10.6	%	3,994		7.8	%
Service and Maintenance	1,486		2.7	%	974		1.9	%
Total	$	54,391			$	51,060

Total revenue increased 6.5% to $54.4 million for the nine months ended September 30, 2021 compared to $51.1 million during the nine months ended September 30, 2020. This increase was primarily a result of higher sales revenue (44.1% increase) during the first nine months of 2021 mainly due to higher parts sales as well as higher rental revenue (2.3% increase).

Rental revenue increased to $47.1 million for the nine months ended September 30, 2021 compared to $46.1 million during the nine months ended September 30, 2020.  This increase during the first nine months of 2021 was attributable to well shut-ins and unit returns due to a significant drop in oil prices resulting from the COVID-19 pandemic and crude oil demand destruction that negatively impacted the nine months ended September 30, 2020. In addition, rental revenues were positively impacted by increases in higher horsepower rentals.

Sales revenue increased to $5.8 million for the nine months ended September 30, 2021 compared to $4.0 million for the same period in 2020. This increase is mostly attributable to an increase in parts sales partially offset by a decrease in compressor sales. The reduction in compressor sales reflects a shift in capital concentration from our customers as more customers have elected to rent compression units rather than allocating capital dollars towards buying new compressors. Sales are subject to fluctuations in timing of industry activity related to capital projects and, as such, can vary substantially between periods.

Cost of rentals increased 17.8% to $25.1 million during the nine months ended September 30, 2021 compared to $21.3 million during the nine months ended September 30, 2020. This increase was primarily due to labor and parts expenses related to a significant increase in repair and maintenance work on our rental fleet as well as increased costs related to newly set units which experience higher upfront costs than typical run rates. While repair and maintenance expenses are customary in our business, the timing of such expenses can fluctuate between periods resulting in periods with larger than normal expenses.

Cost of sales increased 29.6% to $6.0 million during the nine months ended September 30, 2021 compared to $4.6 million during the nine months ended September 30, 2020. This increase during the first nine months of 2021 was primarily due to an increase in parts sales. This increase during the first nine months of 2021 also reflects lower labor efficiency due to much lower activity levels at our fabrication facilities that was partially offset by lower payroll and benefits expenses.

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Selling, general, and administrative expenses increased 8.8% to $8.0 million for the nine months ended September 30, 2021 compared to $7.3 million for the same period in 2020. SG&A expenses during the first nine months of 2021 were impacted by an increase in expected executive bonus compensation expense and officer and director cash long-term incentive expenses. These increases were partially offset by a reduction in professional fees and restricted stock expense.

Depreciation and amortization expense increased 0.8% to $19.0 million for the nine months ended September 30, 2021 compared to $18.9 million for the nine months ended September 30, 2020.  This increase was the result of larger horsepower units being added to the fleet. We added 51 units (approximately 14,060 horsepower) to our fleet over the past 12 months. Twenty-one of those units were 400 horsepower or larger, representing 60% of the horsepower added.

We recorded an income tax benefit of $425,000 for the nine months ended September 30, 2021 compared to an income tax benefit of $4.7 million for the nine months ended September 30, 2020. For interim periods, our income tax benefit (expense) is computed based upon our estimated annual effective tax rate and any discrete items that impact the interim periods with the period ended September 30, 2020 being significantly impacted by prior year amended returns related to the CARES Act.

Non-GAAP Financial Measures

Our definition and use of Adjusted EBITDA

“Adjusted EBITDA” is a non-GAAP financial measure that we define as earnings (net (loss) income) before interest, taxes, depreciation and amortization, as well as non-cash stock compensation, impairment of goodwill, an increase in inventory allowance and inventory write-offs, and retirement of rental equipment.  This term, as used and defined by us, may not be comparable to similarly titled measures employed by other companies and is not a measure of performance calculated in accordance with GAAP. Adjusted EBITDA should not be considered in isolation or as a substitute for operating income, net income or loss, cash flows provided by operating, investing and financing activities, or other income or cash flow statement data prepared in accordance with GAAP.  However, management believes Adjusted EBITDA is useful to an investor in evaluating our operating performance because:

•it is widely used by investors in the energy industry to measure a company’s operating performance without regard to items excluded from the calculation of Adjusted EBITDA, which can vary substantially from company to company depending upon accounting methods and book value of assets, capital structure and the method by which assets were acquired, among other factors;

•it helps investors to more meaningfully evaluate and compare the results of our operations from period to period by removing the impact of our capital structure and asset base from our operating structure; and

•it is used by our management for various purposes, including as a measure of operating performance, in presentations to our Board of Directors, and as a basis for strategic planning and forecasting.

Adjusted EBITDA has limitations as an analytical tool, and you should not consider it in isolation, or as a substitute for analysis of our results as reported under generally accepted accounting principles.  Some of these limitations are:

•Adjusted EBITDA does not reflect our cash expenditures, future requirements for capital expenditures, or contractual commitments;

•Adjusted EBITDA does not reflect changes in, or cash requirements for, our working capital needs;

•Adjusted EBITDA does not reflect the cash requirements necessary to service interest or principal payments on our debts; and

•although depreciation and amortization are non-cash charges, the assets being depreciated and amortized will often have to be replaced in the future, and Adjusted EBITDA does not reflect any capital expenditures for such replacements.

There are other material limitations to using Adjusted EBITDA as a measure of performance, including the inability to analyze the impact of certain recurring items that materially affect our net income or loss, and the lack of comparability of results of operations of different companies.  Please read the table below under “Reconciliation” to see how Adjusted EBITDA reconciles to our net (loss) income, the most directly comparable GAAP financial measure.

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Reconciliation

The following table reconciles our net (loss) income, the most directly comparable GAAP financial measure, to Adjusted EBITDA:

	Three months ended September 30,				Nine months ended September 30,
	2021		2020		2021		2020
	(in thousands)
Net income (loss)	$	(1,257)	$	(562)	$	(3,569)	$	3,685
Interest expense	25		2		40		13
Income tax expense (benefit)	(212)		(167)		(425)		(4,653)
Depreciation and amortization	6,387		6,318		19,010		18,859
Non-cash stock compensation expense	420		563		1,316		1,629
Adjusted EBITDA	$	5,363	$	6,154	$	16,372	$	19,533

For the three months ended September 30, 2021, Adjusted EBITDA decreased $0.8 million (12.9%) due primarily to a $2.1 million increase in costs of rentals compared to the three months ended September 30, 2020. This decrease was partially offset by increased revenues. For the nine months ended September 30, 2021, Adjusted EBITDA decreased $3.2 million (16.2%) due primarily to a $3.8 million increase in costs of rentals when compared to the nine months ended September 30, 2020.

Liquidity and Capital Resources

Our working capital positions as of September 30, 2021 and December 31, 2020 are set forth below:

	September 30,		December 31,
	2021		2020
	(in thousands)
Current Assets:
Cash and cash equivalents	$	24,424	$	28,925
Trade accounts receivable, net	11,594		11,884
Inventory	21,392		19,926
Federal income tax receivable	11,538		11,538
Prepaid income taxes	33		66
Prepaid expenses and other	668		379
Total current assets	69,649		72,718
Current Liabilities:
Accounts payable	1,120		2,373
Accrued liabilities	13,621		6,770
Line of credit	—		417
Current operating leases	94		198
Deferred income	693		1,103
Total current liabilities	15,528		10,861
Total working capital	$	54,121	$	61,857

For the nine months ended September 30, 2021, we invested $19.1 million in rental and property and other equipment. During the nine months ended September 30, 2021, we added $17.9 million in new equipment to our rental fleet and $1.2 million mostly in vehicles as well as various other machinery and equipment. Our investment in rental equipment, property and other equipment also includes any changes to work-in-process related to our rental fleet jobs at the beginning of the period

20

compared to the end of the period. Our rental work-in-process increased by $33,000 during the nine months ended September 30, 2021. We financed our investment in rental equipment, property and other equipment with cash flow from operations and cash on hand.

Cash flows

At September 30, 2021, we had cash and cash equivalents of $24.4 million compared to $28.9 million at December 31, 2020. Our cash flows from operating activities of $20.0 million were partially offset by capital expenditures of $19.1 million during the nine months ended September 30, 2021.  We had working capital of $54.1 million at September 30, 2021 compared to $61.9 million at December 31, 2020. On December 31, 2020, we had outstanding debt of $417,000, which was all related to our line of credit. We generated cash flows from operating activities of $20.0 million during the first nine months of 2021 compared to cash flows provided by operating activities of $27.9 million for the first nine months of 2020. The decline in cash flows from operating activities was primarily driven by higher costs of rentals during the first nine months of 2021 as well as higher SG&A expenses. These increases were partially offset by slightly higher sales margins.

Strategy

For the remainder of 2021, our overall plan is to continue monitoring and holding expenses in line with the anticipated level of activity, fabricate rental fleet equipment only in direct response to market requirements, emphasize marketing of our idle gas compressor units and limit bank borrowing in line with market conditions. For the remainder of 2021, our forecasted capital expenditures are not anticipated to exceed our internally generated cash flows and our cash on hand. Any required capital will be for contracted, premium-priced additions to our compressor rental fleet and/or required service vehicles.  We believe that cash flows from operations and our current cash position will be sufficient to satisfy our capital and liquidity requirements for the foreseeable future.  

Bank Borrowings

We have a senior secured revolving credit agreement the ("Credit Agreement") with Texas Capital Bank, National Association (the "Lender") with an initial commitment of $20 million, and an accordion feature that would increase the maximum commitment to $30 million, subject to collateral availability. We also have a right to request from the Lender, on an uncommitted basis, an increase of up to $30 million on the aggregate commitment; provided however, the aggregate commitment amount is not permitted to exceed $50 million. The maturity date of the Credit Agreement is May 11, 2026. As of September 30, 2021, we did not have any borrowings outstanding under the Credit Agreement.

Critical Accounting Policies and Practices

There have been no changes in the critical accounting policies disclosed in the Company's Form 10-K for the year ended December 31, 2020.

Recently Issued Accounting Pronouncements

Please read Note 2, Summary of Significant Accounting Policies, Recently Issued Accounting Pronouncements in our condensed consolidated financial statements in this report.

Off-Balance Sheet Arrangements

From time-to-time, we enter into off-balance sheet arrangements and transactions that can give rise to off-balance sheet obligations.  As of September 30, 2021, the off-balance sheet arrangements and transactions that we have entered into include purchase agreements. We do not believe that these arrangements are reasonably likely to materially affect our liquidity or availability of capital resources.

Special Note Regarding Forward-Looking Statements

Except for historical information contained herein, the statements in this report are forward-looking and made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995.  Forward-looking statements involve known and unknown risks and uncertainties, which may cause our actual results in future periods to differ materially from forecasted results.  Those risks include, among other things, the loss of market share through competition or otherwise; the introduction of competing technologies by other companies; a prolonged, substantial reduction in oil and natural gas prices,

21

which could cause a decline in the demand for our products and services; and new governmental safety, health and environmental regulations, which could require us to make significant capital expenditures. The forward-looking statements included in this Form 10-Q are only made as of the date of this report, and we undertake no obligation to publicly update such forward-looking statements to reflect subsequent events or circumstances. A discussion of these and other risk factors is included in our Annual Report on Form 10-K for the year ended December 31, 2020 filed with the SEC.

Item 3.   Quantitative and Qualitative Disclosures about Market Risk

There have been no changes in the market risks disclosed in the Company's Form 10-K for the year ended December 31, 2020.

Item 4.  Controls and Procedures

Evaluation of Disclosure Controls and Procedures.

An evaluation was carried out under the supervision and with the participation of our management, including our President and Chief Executive Officer and our Vice President and Chief Financial Officer, of the effectiveness of the design of our “disclosure controls and procedures” (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended or, the “Exchange Act”) as of December 31, 2020, pursuant to Exchange Act Rule 13a-15. In designing and evaluating our disclosure controls and procedures, we recognize that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and our management necessarily applies its judgment in evaluating and implementing possible controls and procedures. Based upon that evaluation, the President and Chief Executive Officer and our Vice President and Chief Financial Officer concluded that, as of the end of the period covered by this report, our disclosure controls and procedures were effective.

PART II – OTHER INFORMATION

Item 1.  Legal Proceedings

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

Item 1A.  Risk Factors

Please refer to and read Item 1A, Risk Factors in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020 for a discussion of the risks associated with our Company and industry.

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Item 2.  Unregistered Sales of Equity Securities and Use of Proceeds

During the three months ended September 30, 2021, we did not sell any securities which were not registered under the Securities Act of 1933. The following table summarizes our purchases of shares of common stock during this period.

ISSUER PURCHASES OF EQUITY SECURITIES1,2
	(a)	(b)	(c)	(d)
For the Three Months Ended September 30, 2021	Total Number of Shares Purchased	Average Price Paid per Share	Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares that may yet be Purchased Under Plans or Programs3
Common Stock
				(in thousands)
July 1, 2021 to July 31, 2021	79,487	$9.94	79,487	$6,827
August 1, 2021 to August 31, 2021	68,868	$9.89	68,868	$6,146
September 1, 2021 to September 30, 2021	109,369	$9.76	109,369	$10,000

1 The table summarizes repurchases of (and remaining authority to repurchase) shares of our Common Stock.

2 The figures in the table reflect transactions according to the settlement dates. For purposes of our unaudited consolidated financial statements included in this Form 10-Q, the impact of these repurchases is recorded according to the settlement dates.

3 Our Board of directors authorized the repurchase of up to $10.0 million of our outstanding Common Stock in the open market (pursuant to Rule 10b5-1 plans or otherwise), block trades or privately negotiated transactions. On October 23, 2020, the repurchase program, which was initially set to expire on September 30, 2020, was extended to September 30, 2021. On September 30, 2021, our Board of Directors authorized the repurchase of up to an additional $10.0 million of our outstanding Common Stock in the open market (pursuant to Rule 10b5-1 plans or otherwise), block trades or privately negotiated transactions. This repurchase program is set to expire on September 30, 2022. The amounts in this column indicate the remaining amounts that may yet be expended to repurchase shares under these authorizations.

Item 3.  Defaults Upon Senior Securities

None.

Item 4.  Mine Safety Disclosures

None.

Item 5. Other Information

None.

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Item 6.   Exhibits

The following exhibits are filed herewith or incorporated herein by reference, as indicated:

Exhibit No.	Description
3.1	Articles of Incorporation, as amended (Incorporated by reference to Exhibit 3.1 of the 10-QSB filed and dated November 10, 2004)
3.2	Bylaws as amended (Incorporated by reference to Exhibit 3.1 of the Registrant's current report on form 8-K filed with the Securities and Exchange Commission on February 10, 2021.

10.1	2019 Equity Incentive Plan (Incorporated by reference to Exhibit 4.1 of the Registrant’s Current Report on Form 8-K dated June 20, 2019 and filed with the Securities and Exchange Commission on June 21, 2019.)
10.2	Stock Option Plan, as amended and restated (Incorporated by reference to Exhibit 10.1 of the Registrant’s Current Report on Form 8-K filed with the Securities and Exchange Commission on June 21, 2016.)
10.3	Amended and restated Employment Agreement dated April 27, 2015 between Natural Gas Services Group, Inc. and Stephen C. Taylor (Incorporated by reference to Exhibit 10.1 of the Registrant’s Current Report on Form 8-K filed with the Securities and Exchange Commission on April 29, 2015.)
10.4	The Executive Nonqualified Excess Plan Adoption Agreement, referred to as the Nonqualified Deferred Compensation Plan (Incorporated by reference to Exhibit 10.11 of the Registrant's Quarterly report on Form 10-Q filed with the Securities and Exchange Commission on May 6, 2016.)

*10.5	Amended Annual Incentive Bonus Plan
10.6	Credit Agreement dated as of May 11, 2021, among the Natural Gas Services Group, Inc. and NGSG Properties, LLC, a Colorado limited liability company, the banks and other financial institutions identified therein as Lenders from time to time party thereto and Texas Capital Bank, National Association, as Administrative Agent, Swing Line Lender and L/C Issuer.
10.7	Pledge and Security Agreement dated as of May 11, 2021, among Natural Gas Services Group, Inc., the Loan Parties (as defined therein) and Texas Capital Bank, National Association, as Administrative Agent.
10.8	Note dated as of May 11, 2021, by Natural Gas Services Group, Inc. in favor of Texas Capital Bank, National Association, as Lender.
*31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
*31.2	Certification of Principal Accounting Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
*32.1	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
*32.2	Certification of Principal Accounting Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document
	* Filed herewith.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

NATURAL GAS SERVICES GROUP, INC.

/s/ Stephen C. Taylor	/s/ Micah C. Foster
Stephen C. Taylor	Micah C. Foster
President and Chief Executive Officer	Vice President and Chief Financial Officer
(Principal Executive Officer)	(Principal Accounting Officer)
November 12, 2021	November 12, 2021

EX-31.1

Exhibit 31.1

Certifications

I, Stephen C. Taylor, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Natural Gas Services Group, Inc;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

1.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Dated:	August 13, 2021		Natural Gas Services Group, Inc.
		By:	/s/ Stephen C. Taylor
			Stephen C. Taylor,
			President, CEO and Chairman of the Board of Directors
			(Principal Executive Officer)

EX-31.2

Exhibit 31.2

Certifications

I, Micah C. Foster, certify that:

1.    I have reviewed this Quarterly Report on Form 10-Q of Natural Gas Services Group, Inc;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f) for the registrant and have:

(a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Dated:	August 13, 2021		Natural Gas Services Group, Inc.
		By:	/s/ Micah C. Foster
			Micah C. Foster
			Vice President and Chief Financial Officer
			(Principal Accounting Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. §1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Natural Gas Services Group, Inc. (the “Company”) on Form 10-Q for the period ended September 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Stephen C. Taylor, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2.    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated:	August 13, 2021		Natural Gas Services Group, Inc.
		By:	/s/ Stephen C. Taylor
			Stephen C. Taylor,
			President, CEO and Chairman of the Board of Directors
			(Principal Executive Officer)

The foregoing certification is being furnished solely to accompany the Report pursuant to 18 U.S.C. § 1350, and is not being filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and is not to be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. §1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Natural Gas Services Group, Inc. (the “Company”) on Form 10-Q for the period ended September 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Micah C. Foster, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2.    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated:	August 13, 2021		Natural Gas Services Group, Inc.
		By:	/s/ Micah C. Foster
			Micah C. Foster
			Vice President and Chief Financial Officer
			(Principal Accounting Officer)

The foregoing certification is being furnished solely to accompany the Report pursuant to 18 U.S.C. § 1350, and is not being filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and is not to be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

XML

Cover - shares	9 Months Ended
	Sep. 30, 2021	Nov. 08, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
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
Title of 12(b) Security	Common Stock, Par Value $0.01
Trading Symbol	NGS
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		13,038,719
Entity Central Index Key	0001084991
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 24,424	$ 28,925
Trade accounts receivable, net of allowance for doubtful accounts of $1,150 and $1,161, respectively	11,594	11,884
Inventory	21,392	19,926
Federal income tax receivable	11,538	11,538
Prepaid income taxes	33	66
Prepaid expenses and other	668	379
Total current assets	69,649	72,718
Long-term inventory, net of allowance for obsolescence of $37 and $221, respectively	1,250	1,065
Rental equipment, net of accumulated depreciation of $192,827 and $175,802, respectively	208,396	207,585
Property and equipment, net of accumulated depreciation of $15,293 and $13,916, respectively	21,120	21,749
Right of use assets - operating leases, net of accumulated amortization of $519 and $356, respectively	321	483
Intangibles, net of accumulated amortization of $2,102 and $2,008, respectively	1,057	1,151
Other assets	2,513	2,050
Total assets	304,306	306,801
Current Liabilities:
Accounts payable	1,120	2,373
Accrued liabilities	13,621	6,770
Line of credit	0	417
Current operating leases	94	198
Deferred income	693	1,103
Total current liabilities	15,528	10,861
Deferred income tax liability	41,448	41,890
Long-term operating leases	227	285
Other long-term liabilities	2,578	2,221
Total liabilities	59,781	55,257
Commitments and contingencies
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; 13,394 and 13,296 shares issued, respectively	134	133
Additional paid-in capital	113,596	112,615
Retained earnings	135,717	139,286
Treasury Shares, at cost, 471 and 38 shares, respectively	(4,922)	(490)
Total stockholders' equity	244,525	251,544
Total liabilities and stockholders' equity	$ 304,306	$ 306,801

XML

Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current Assets:
Allowance for doubtful accounts	$ 1,150	$ 1,161
Allowance for obsolescence	37	221
Noncurrent Assets:
Accumulated depreciation, rental equipment	192,827	175,802
Accumulated depreciation, property and equipment	15,293	13,916
Accumulated amortization, operating lease right of use assets	519	356
Accumulated amortization, intangibles	$ 2,102	$ 2,008
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 dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued (in shares)	13,394,000	13,296,000
Treasury shares (in shares)	470,667	38,000

XML

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue:
Rental income	$ 16,195	$ 14,861	$ 47,149	$ 46,092
Revenue from contracts with customers	2,050	904	7,242	4,968
Total revenue	18,245	15,765	54,391	51,060
Operating costs and expenses:
Cost of rentals, exclusive of depreciation stated separately below	8,826	6,760	25,065	21,286
Cost of sales, exclusive of depreciation stated separately below	1,563	997	5,955	4,596
Cost of service and maintenance, exclusive of depreciation stated separately below	327	138	625	363
Selling, general and administrative expenses	2,705	2,493	7,960	7,318
Depreciation and amortization	6,387	6,318	19,010	18,859
Total operating costs and expenses	19,808	16,706	58,615	52,422
Operating loss	(1,563)	(941)	(4,224)	(1,362)
Other income (expense):
Interest expense	(25)	(2)	(40)	(13)
Other income, net	119	214	270	407
Total other income (expense), net	94	212	230	394
Loss before provision for income taxes	(1,469)	(729)	(3,994)	(968)
Income tax benefit	212	167	425	4,653
Net (loss) income	$ (1,257)	$ (562)	$ (3,569)	$ 3,685
(Loss) earnings per share:
Basic (in dollars per share)	$ (0.10)	$ (0.04)	$ (0.27)	$ 0.28
Diluted (in dollars per share)	$ (0.10)	$ (0.04)	$ (0.27)	$ 0.27
Weighted average shares outstanding:
Basic (in shares)	13,121	13,248	13,225	13,214
Diluted (in shares)	13,121	13,248	13,225	13,471
Sales
Revenue:
Revenue from contracts with customers	$ 1,472	$ 536	$ 5,756	$ 3,994
Service and maintenance income
Revenue:
Revenue from contracts with customers	$ 578	$ 368	$ 1,486	$ 974

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Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2019		0	13,178,000			(38,000)
Beginning balance 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 (in shares)			95,000
Compensation expense on restricted common stock	486		$ 1	485
Taxes paid related to net shares settlement of equity awards	(149)			(149)
Net income (loss)	4,082				4,082
Ending balance (in shares) at Mar. 31, 2020		0	13,273,000			(38,000)
Ending balance at Mar. 31, 2020	252,129	$ 0	$ 133	110,926	141,560	$ (490)
Beginning balance (in shares) at Dec. 31, 2019		0	13,178,000			(38,000)
Beginning balance at Dec. 31, 2019	247,693	$ 0	$ 132	110,573	137,478	$ (490)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,685
Ending balance (in shares) at Sep. 30, 2020		0	13,290,000			(38,000)
Ending balance at Sep. 30, 2020	252,858	$ 0	$ 133	112,052	141,163	$ (490)
Beginning balance (in shares) at Mar. 31, 2020		0	13,273,000			(38,000)
Beginning balance at Mar. 31, 2020	252,129	$ 0	$ 133	110,926	141,560	$ (490)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation expense on common stock options	1			1
Issuance of restricted stock (in shares)			13,000
Compensation expense on restricted common stock	562			562
Net income (loss)	165				165
Ending balance (in shares) at Jun. 30, 2020		0	13,286,000			(38,000)
Ending balance at Jun. 30, 2020	252,857	$ 0	$ 133	111,489	141,725	$ (490)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation expense on common stock options	1			1
Issuance of restricted stock (in shares)			4,000
Compensation expense on restricted common stock	562			562
Net income (loss)	(562)				(562)
Ending balance (in shares) at Sep. 30, 2020		0	13,290,000			(38,000)
Ending balance at Sep. 30, 2020	252,858	$ 0	$ 133	112,052	141,163	$ (490)
Beginning balance (in shares) at Dec. 31, 2020		0	13,296,000			(38,000)
Beginning balance at Dec. 31, 2020	251,544	$ 0	$ 133	112,615	139,286	$ (490)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock (in shares)			62,000
Compensation expense on restricted common stock	474		$ 1	473
Taxes paid related to net shares settlement of equity awards	(224)			(224)
Net income (loss)	(394)				(394)
Ending balance (in shares) at Mar. 31, 2021		0	13,358,000			(38,000)
Ending balance at Mar. 31, 2021	251,400	$ 0	$ 134	112,864	138,892	$ (490)
Beginning balance (in shares) at Dec. 31, 2020		0	13,296,000			(38,000)
Beginning balance at Dec. 31, 2020	$ 251,544	$ 0	$ 133	112,615	139,286	$ (490)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of treasury shares (in shares)	432,731
Purchase of treasury shares	$ (4,400)
Net income (loss)	(3,569)
Ending balance (in shares) at Sep. 30, 2021		0	13,394,000			(471,000)
Ending balance at Sep. 30, 2021	244,525	$ 0	$ 134	113,596	135,717	$ (4,922)
Beginning balance (in shares) at Mar. 31, 2021		0	13,358,000			(38,000)
Beginning balance at Mar. 31, 2021	251,400	$ 0	$ 134	112,864	138,892	$ (490)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock (in shares)			36,000
Compensation expense on restricted common stock	421			421
Taxes paid related to net shares settlement of equity awards	(110)			(110)
Purchase of treasury shares (in shares)						175,000
Purchase of treasury shares	(1,892)					$ (1,892)
Net income (loss)	(1,918)				(1,918)
Ending balance (in shares) at Jun. 30, 2021		0	13,394,000			(213,000)
Ending balance at Jun. 30, 2021	247,901	$ 0	$ 134	113,175	136,974	$ (2,382)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation expense on restricted common stock	421			421
Purchase of treasury shares (in shares)						258,000
Purchase of treasury shares	(2,540)					$ (2,540)
Net income (loss)	(1,257)				(1,257)
Ending balance (in shares) at Sep. 30, 2021		0	13,394,000			(471,000)
Ending balance at Sep. 30, 2021	$ 244,525	$ 0	$ 134	$ 113,596	$ 135,717	$ (4,922)

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (3,569)	$ 3,685
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	19,010	18,859
Amortization of debt issuance costs	18	0
Deferred income taxes	(442)	233
Stock-based compensation	1,316	1,628
Bad debt allowance	65	287
Gain on sale of assets	(127)	(284)
Loss (gain) on company owned life insurance	(162)	19
Changes in operating assets and liabilities:
Trade accounts receivables	225	(1,565)
Inventory	(1,682)	3,793
Federal income tax receivable	0	(11,083)
Prepaid expenses and prepaid income taxes	(256)	(86)
Accounts payable and accrued liabilities	5,599	2,174
Deferred income	(410)	(57)
Deferred tax liability increase due to tax law change	0	10,103
Other	373	226
NET CASH PROVIDED BY OPERATING ACTIVITIES	19,958	27,932
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of rental equipment, property and other equipment	(19,080)	(11,964)
Purchase of company owned life insurance	(98)	(254)
Proceeds from sale of property and equipment	141	394
Proceeds from sale of deferred compensation mutual fund	0	10
NET CASH USED IN INVESTING ACTIVITIES	(19,037)	(11,814)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from loan	0	4,601
Repayment of loan	0	(4,601)
Payments of other long-term liabilities, net	(1)	(2)
Payments of debt issuance costs	(237)	0
Repayments of line of credit, net	(417)	0
Purchase of treasury shares	(4,432)	0
Taxes paid related to net share settlement of equity awards	(335)	(149)
NET CASH USED IN FINANCING ACTIVITIES	(5,422)	(151)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(4,501)	15,967
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	28,925	11,592
CASH AND CASH EQUIVALENTS AT END OF PERIOD	24,424	27,559
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid	25	13
Income taxes paid	0	95
NON-CASH TRANSACTIONS
Right of use asset acquired through an operating lease	$ 0	$ 52

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Description of Business	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of BusinessNatural 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.

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

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. 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 September 30, 2021 and the results of our operations for the three and nine months ended September 30, 2021 and 2020 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, 2020 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 and nine months ended September 30, 2021 are not necessarily indicative of the results of operations to be expected for the full fiscal year ending December 31, 2021.

Revenue Recognition Policy

The Company recognizes revenue in accordance with ASC 606, Revenue from Contracts with Customers ("ASC 606"), except for rental revenue as discussed below. 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 condensed 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 period. 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, 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 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 and 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 maintained by the customer and there are no exceptions to the customer’s commitment to accept and pay for the manufactured equipment. There was no revenue recognized for bill and hold arrangements for the nine months ended September 30, 2021. Revenue recognized related to bill and hold arrangements for the nine months ended September 30, 2020 was approximately $852,000.

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 and nine months ended September 30, 2021 and 2020:

	Three months ended September 30,				Nine months ended September 30,
	2021		2020		2021		2020
	(in thousands)				(in thousands)
Compressors - sales	$	—	$	—	$	1,891	$	2,211
Flares - sales	74		67		149		308
Other (parts/rebuilds) - sales	1,398		469		3,716		1,475
Service and maintenance	578		368		1,486		974
Total revenue from contracts with customers	2,050		904		7,242		4,968
Add: ASC 842 rental revenue	16,195		14,861		47,149		46,092
Total revenue	$	18,245	$	15,765	$	54,391	$	51,060

Contract Balances

As of September 30, 2021 and December 31, 2020, we had the following receivables and deferred income from contracts with customers:

	September 30, 2021		December 31, 2020
	(in thousands)
Accounts Receivable
Accounts receivable - contracts with customers	$	3,359	$	3,243
Accounts receivable - ASC 842	9,385		9,802
Total Accounts Receivable	$	12,744	$	13,045
Less: Allowance for doubtful accounts	(1,150)		(1,161)
Total Accounts Receivable, net	$	11,594	$	11,884
Deferred income	$	693	$	1,103

The Company recognized sales and rental revenues of $1.1 million and $2,000, respectively, for the nine months ended September 30, 2021 that was included in deferred income at the beginning of 2021. For the year ended December 31, 2020, the Company recognized sales and rental revenues of $533,000 and $73,000, respectively, that was included in deferred income at the beginning of 2020.

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

Remaining Performance Obligations

As of September 30, 2021, 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.

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. Valuation allowances are established to reduce deferred tax assets when it is more likely than not that some portion or all of the deferred tax assets will not be realized. 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.

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. Tax benefits are recognized only for tax positions that are more likely than not to be sustained upon examination by tax authorities. The amount recognized is measured as the largest amount of benefit that is greater than 50% likely to be realized upon settlement. A liability for unrecognized tax benefits is recorded for any tax benefits claimed in our tax returns that do not meet these recognition and measurement standards. We have no liabilities for uncertain tax positions as of September 30, 2021.

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

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act") was enacted in response to the economic impact caused by 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 see Note 4, Federal Income Tax Receivable for a discussion about the impact on our condensed consolidated financial statements.

Recently Issued Accounting Pronouncements

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.

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Inventory

9 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Inventory

Inventory

Our inventory, net of allowance for obsolescence of $37,000 at September 30, 2021 and $221,000 at December 31, 2020, consisted of the following amounts:

	September 30, 2021		December 31, 2020
	(in thousands)
Raw materials - current	$	20,381	$	18,026
Work-in-process	1,011		1,900
Inventory - current	21,392		19,926
Raw materials - long term (net of allowances of $37 and $221, respectively)	1,250		1,065
Inventory - total	$	22,642	$	20,991

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.

Inventory Allowance

We routinely review our inventory allowance balance to account for slow moving or obsolete inventory costs that may not be recoverable in the future.

A summary of our inventory allowance is as follows:

	September 30, 2021		December 31, 2020
	(in thousands)
Beginning balance	$	(221)	$	(24)
Accruals	—		(251)
Write-offs	184		54
Ending balance	$	(37)	$	(221)

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Federal Income Tax Receivable	9 Months Ended
	Sep. 30, 2021
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 has filed amended returns to carryback these losses for five years. Accordingly, during 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. During the third quarter of 2020, the Company received refunds totaling $3.9 million related to its 2018 NOLs, which reduced its federal income tax receivable to $11.5 million on its condensed consolidated balance sheet as of September 30, 2021.

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Rental Equipment

9 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

Rental Equipment

Rental Equipment

Our rental equipment and associated accumulated depreciation as of September 30, 2021 and December 31, 2020, respectively, consisted of the following:

	September 30, 2021		December 31, 2020
	(in thousands)
Compressor units	$	397,426	$	379,623
Work-in-process	3,797		3,764
Rental equipment	401,223		383,387
Accumulated depreciation	(192,827)		(175,802)
Rental equipment, net of accumulated depreciation	$	208,396	$	207,585

We evaluated our rental equipment for potential impairment as of September 30, 2021, and determined that no such impairment existed as of that date.

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Credit Facility

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Credit Facility

Credit Facility

Previous Credit Agreement

We had a senior secured revolving credit agreement the ("Previous Credit Agreement") with JP Morgan Chase Bank, N.A (the "Lender") that matured on March 31, 2021. Prior to maturation, the outstanding balance of $417,000 was repaid. The Previous Credit Agreement had an aggregate commitment of $30 million, subject to collateral availability.

New Credit Agreement

On May 11, 2021, we entered into a five year senior secured revolving credit agreement ("New Credit Agreement") with Texas Capital Bank, National Association (the "Lender") with an initial commitment of $20 million and an accordion feature that would increase the maximum commitment to $30 million, subject to collateral availability. We also have a right to request from the Lender, on an uncommitted basis, an increase of up to $30 million on the aggregate commitment; provided, however, the aggregate commitment amount is not permitted to exceed $50 million. The maturity date of the New Credit Agreement is May 11, 2026. The obligations under the New Credit Agreement are secured by a first priority lien on a variety of our assets, including inventory and accounts receivable as well as a variable number of our leased compressor equipment.

Borrowing Base. At any time before the maturity of the New 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) 90% of eligible accounts receivable owed to the Company by investment grade debtors, plus (b) 85% of the eligible accounts receivable owing by non-investment grade debtors, plus (c) 50% of the eligible inventory,

valued at the lower of cost or market value at such time, subject to a cap of this component not to exceed $2.0 million, plus (d) the lesser of (i) 95% of the net book value of the compressors that the Lender has determined are eligible for the extension of credit, valued at the lower of cost or market value with depreciation not to exceed 25 years, at such time and (ii) 80% of the net liquidation value percentage of the net book value of the eligible compressors that the Lender has determined are eligible for the extension of credit, valued at the lower of cost or market value with depreciation not to exceed 25 years, at such time, plus (e) 80% of the value at cost (excluding any costs for capitalized interest or other non-cash capitalized costs) of the eligible new compressor fleet, minus (f) any required availability reserves determined by the Lender in its sole discretion. The Lender may adjust the borrowing base components if material deviations in the collateral are discovered in future audits of the collateral. As of September 30, 2021, our allowable borrowing base was $20.0 million.

Interest and Fees. Under the terms of the New Credit Agreement, we have the option of selecting the applicable variable rate for each revolving loan, or portion thereof, of either (a) the Base Rate (as defined below) plus the Applicable Margin, or (b) in the case of a Eurodollar Rate Loan, the Adjusted Eurodollar Rate plus the Applicable Margin. "Base Rate" means, for any day, a rate of interest per annum equal to the highest of (a) the prime rate for such day; (b) the sum of the federal funds rate for such day plus 0.50%; and (c) the Adjusted Eurodollar Rate for such day plus 1.00%. The Applicable Margin is determined based upon the leverage ratio as set forth in the most recent compliance certificate received by the Lender for each fiscal quarter from time to time pursuant to the New Credit Agreement. Depending on the leverage ratio, the Applicable Margin can be 0.25% to 0.75% for Base Rate Loans (as defined in the New Credit Agreement) and 1.25% to 1.75% for Eurodollar Rate Loans and for requested letters of credit. In addition, we are required to pay a monthly commitment fee on the daily average unused amount of the commitment while the New Credit Agreement is in effect at an annual rate equal to 0.25% of the unused commitment amount. Accrued interest is payable monthly on outstanding principal amounts and unused commitment fee, provided that accrued interest on Eurodollar Rate Loans is payable at the end of each interest period, but in no event less frequently than quarterly.

Covenants. The New Credit Agreement contains customary representations and warranties, as well as covenants which, among other things, condition or 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 are applicable during certain trigger periods specified in the Credit Agreement and require us during such trigger periods to maintain a leverage ratio less than or equal to 3.00 to 1.00 as of the last day of each fiscal quarter and a fixed charge coverage ratio greater than or equal to 1.00 to 1.00 as of the last day of each fiscal quarter.

Events of Default and Acceleration. The New 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 Credit Agreement and the other transaction 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 $1.0 million; certain bankruptcy or insolvency events; the rendering of certain judgments in excess of $1.0 million; certain ERISA events; certain change in control events and the defectiveness of any liens under the secured revolving credit agreement. Obligations outstanding under the Credit Agreement may be accelerated upon the occurrence of an event of default.

As of September 30, 2021, we were in compliance with all financial covenants in our New Credit Agreement. At September 30, 2021, we had no amounts outstanding under the New Credit Agreement.

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Stock-Based and Other Long-Term Incentive Compensation

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Stock-Based and Other Long-Term Incentive Compensation

Stock-Based and Other Long-Term Incentive Compensation

Stock Options

A summary of all option activity as of December 31, 2020, and changes during the nine months ended September 30, 2021 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, 2020	161,334	$	24.48	3.48	$	—
Granted	—	—		—	—
Cancelled / Forfeited	—	—		—	—
Expired	(16,000)	17.81		—	—
Outstanding, September 30, 2021	145,334	$	25.21	3.11	$	—
Exercisable, September 30, 2021	145,334	$	25.21	3.11	$	—

The following table summarizes information about our stock options outstanding at September 30, 2021:

Range of Exercise Prices	Options Outstanding				Options Exercisable
	Shares	Weighted Average Remaining Contractual Life (years)	Weighted Average Exercise Price		Shares	Weighted Average Exercise Price
$0.01-18.00	8,500	0.32	$	14.89	8,500	$	14.89
$18.01-22.00	20,500	1.47	18.75		20,500	18.75
$22.01-26.00	42,167	3.53	22.90		42,167	22.90
$26.01-30.00	30,000	5.38	28.15		30,000	28.15
$30.01-34.00	44,167	2.47	30.41		44,167	30.41
	145,334	3.11	$	25.21	145,334	$	25.21

As of September 30, 2021 and December 31, 2020, there were no unvested stock options.

As of September 30, 2021, there was no unrecognized compensation cost related to unvested options. For the nine months ended September 30, 2021 there was no compensation expense for stock options. For the nine months ended September 30, 2020, total compensation expense for stock options was $18,000.

Restricted Shares/Units

In accordance with the Company's employment agreement with Stephen Taylor, the Company's Chief Executive Officer, the Compensation Committee of the Company's Board of Directors reviewed his performance in determining the issuance of restricted common stock. Based on this review, which included consideration of the Company's 2020 performance, Mr. Taylor was awarded 109,212 restricted shares on March 18, 2021, which vest over three years, in equal annual installments, beginning March 18, 2022. On March 18, 2021, the Compensation Committee awarded 20,000 restricted shares to our Vice President of Technical Services, James Hazlett. The restricted shares to Mr. Hazlett vest over three years, in equal annual installments, beginning March 18, 2022. On June 17, 2021, the Compensation Committee awarded 5,000 restricted shares to our Vice President and Chief Financial Officer, Micah C. Foster. The restricted shares granted to Mr. Foster vest over 3 years, in equal annual installments, beginning on June 17, 2022. On March 18, 2021, we also awarded and issued 5,612 shares of restricted common stock to each of our three independent members of our Board of Directors as partial payment for their services in 2021. On April 1, 2021, we awarded and issued 5,291 shares of restricted common stock to a newly appointed member of our Board of Directors as partial payment for his services in 2021. These awards of restricted stock vest one year from the date of grant. Total compensation expense related to these and previously granted restricted stock awards was $1.3 million and $1.7 million for the nine months ended September 30, 2021 and 2020, respectively. As of September 30, 2021, there was a total of $1.8 million of unrecognized compensation expense related to these shares/units which is expected to be recognized over the next 1.7 years.

A summary of all restricted stock/units outstanding as of December 31, 2020 and activity during the nine months ended September 30, 2021 is presented below:

	Number  of Shares	Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2020	258,101	$	12.87	1.61	$	2,447
Granted	156,339	8.93			1,406
Vested	(134,788)	14.94			1,258
Canceled/Forfeited	(3,333)	12.26			31
Outstanding, September 30, 2021	276,319	$	9.63	2.03	$	2,868

Other Long-Term Incentive Compensation

On April 28, 2020, based on its review of Mr. Taylor's 2019 performance, the Compensation Committee issued a long-term incentive award of $1.1 million to Mr. Taylor that vests in equal, annual tranches over 3 years beginning on the anniversary of the grant date. At the time of vesting, each tranche was or will be payable in cash or common stock at the discretion of the Compensation Committee. On March 18, 2021, based on its review of Mr. Taylor's 2020 performance, the Compensation Committee issued a long-term incentive award of $973,080 to Mr. Taylor that vests in equal, annual tranches over 3 years beginning on the anniversary of the grant date. In addition, on April 28, 2020, we issued a $50,000 award to three of our independent members of our Board of Directors as partial payment for their services in 2020. These awards vest one year from the date of grant and are payable in cash upon vesting. On March 18, 2021, we issued a $50,000 award to three of our independent members of our Board of Directors as partial payment for their services in 2021. On April 1, 2021, we issued a $50,000 award to a newly appointed independent member of our Board of Directors as partial payment for his services in 2021. These awards vest one year from the date of grant and are payable in cash upon vesting. The Company accounts for these other long-term incentive awards to Mr. Taylor and our independent Board members as liabilities under accrued liabilities on our condensed consolidated balance sheet. The vesting of these awards awards is subject to acceleration upon certain events, such as (i) death or disability of the recipient, (ii) certain circumstances in connection with a change of control of the Company, (iii) for executive officers, termination without cause (as defined in the agreement), and (iv) for executive officers, resignation for good reason (as defined). Total compensation expense related to these other long-term incentive awards was approximately $600,000 and $252,000 for the nine months ended September 30, 2021 and 2020, respectively. As of September 30, 2021, there was a total of $1.4 million of unrecognized compensation expense related to these other long-term incentive awards which is expected to be recognized over the next 2.0 years.

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(Loss) Earnings per Share

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

(Loss) Earnings per Share

(Loss) Earnings per Share

The following table reconciles the numerators and denominators of the basic and diluted (loss) earnings per share computation:

	Three months ended				Nine months ended
	September 30,				September 30,
	2021		2020		2021		2020
	(in thousands, except per share data)
Numerator:
Net (loss) income	$	(1,257)	$	(562)	$	(3,569)	$	3,685
Denominator for (loss) earnings per basic common share:
Weighted average common shares outstanding	13,121		13,248		13,225		13,214
Denominator for (loss) earnings per diluted common share:
Weighted average common shares outstanding	13,121		13,248		13,225		13,214
Dilutive effect of stock options and restricted stock/units	—		—		—		257
Diluted weighted average shares	13,121		13,248		13,225		13,471
(Loss) earnings per common share:
Basic	$	(0.10)	$	(0.04)	$	(0.27)	$	0.28
Diluted	$	(0.10)	$	(0.04)	$	(0.27)	$	0.27

For the three and nine months ended September 30, 2021, 276,319 restricted stock/units and 145,334 stock options were not included in the computation of diluted loss per share due to their antidilutive effect.

For the three months ended September 30, 2020, 262,781 restricted stock/units and 166,334 stock options were not included in the computation of diluted earnings per share due to their antidilutive effect. For the nine months ended September 30, 2020, 10,774 restricted stock/units and 171,900 stock options were not included in the computation of diluted earnings per share due to their antidilutive effect.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2021

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.

Stock Repurchase Program

On August 12, 2019, the Company announced the Board of Directors had authorized the repurchase of up to $10.0 million of its outstanding shares of common stock in the open market, block trades or privately negotiated transactions. The timing and extent of any repurchase is subject to the discretion of management and is dependent upon market pricing and conditions, business, legal, accounting and other considerations. The repurchase program does not obligate the Company to purchase any shares and was set to expire on September 30, 2020, subject to earlier termination of the program by the Board of Directors. On October 23, 2020, the Board of Directors authorized the extension of the repurchase program through September 30, 2021. The repurchase program may be modified, suspended or terminated at any time without notice, in the Company’s discretion, based upon a number of factors, including market conditions, the cost of repurchasing shares, the availability of alternative investment opportunities, liquidity, the need for capital in the Company’s operations and other factors deemed appropriate. The Company intends to finance the repurchases with existing liquidity and free cash flow. For the nine months ended September 30, 2021, the Company repurchased 432,731 of its outstanding shares of common stock with a value of $4.4 million, at an average price of $10.24. As of September 30, 2021, the expiration date of the plan, the Company had repurchased 470,667 of its outstanding shares of common stock with a value of $4.9 million, at an average price of $10.46. On September 30, 2021, the Board of Directors authorized a new repurchase plan for up to $10.0 million of its outstanding shares of common stock in the open market, block trades or privately negotiated transactions. The terms of the new plan remain unchanged from the terms of the plan that expired on September 30, 2021. For further information, see Part II Item 2 - Unregistered Sales of Equity Securities and Use of Proceeds.

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Subsequent Events	9 Months Ended
	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsNone.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2021

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. 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 September 30, 2021 and the results of our operations for the three and nine months ended September 30, 2021 and 2020 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, 2020 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 and nine months ended September 30, 2021 are not necessarily indicative of the results of operations to be expected for the full fiscal year ending December 31, 2021.

Revenue Recognition Policy and Contract Costs

Revenue Recognition Policy

The Company recognizes revenue in accordance with ASC 606, Revenue from Contracts with Customers ("ASC 606"), except for rental revenue as discussed below. 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 condensed 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 period. 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, 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 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 and 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 maintained by the customer and there are no exceptions to the customer’s commitment to accept and pay for the manufactured equipment. There was no revenue recognized for bill and hold arrangements for the nine months ended September 30, 2021. Revenue recognized related to bill and hold arrangements for the nine months ended September 30, 2020 was approximately $852,000.

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.

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. Valuation allowances are established to reduce deferred tax assets when it is more likely than not that some portion or all of the deferred tax assets will not be realized. 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.

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. Tax benefits are recognized only for tax positions that are more likely than not to be sustained upon examination by tax authorities. The amount recognized is measured as the largest amount of benefit that is greater than 50% likely to be realized upon settlement. A liability for unrecognized tax benefits is recorded for any tax benefits claimed in our tax returns that do not meet these recognition and measurement standards. We have no liabilities for uncertain tax positions as of September 30, 2021.

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

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act") was enacted in response to the economic impact caused by 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.

Recently Issued Accounting Pronouncements

Recently Issued Accounting Pronouncements

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.

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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Disaggregation of Revenue

The following table shows the Company's revenue disaggregated by product or service type for the three and nine months ended September 30, 2021 and 2020:

	Three months ended September 30,				Nine months ended September 30,
	2021		2020		2021		2020
	(in thousands)				(in thousands)
Compressors - sales	$	—	$	—	$	1,891	$	2,211
Flares - sales	74		67		149		308
Other (parts/rebuilds) - sales	1,398		469		3,716		1,475
Service and maintenance	578		368		1,486		974
Total revenue from contracts with customers	2,050		904		7,242		4,968
Add: ASC 842 rental revenue	16,195		14,861		47,149		46,092
Total revenue	$	18,245	$	15,765	$	54,391	$	51,060

Schedule of Contract with Customer, Asset and Liability

As of September 30, 2021 and December 31, 2020, we had the following receivables and deferred income from contracts with customers:

	September 30, 2021		December 31, 2020
	(in thousands)
Accounts Receivable
Accounts receivable - contracts with customers	$	3,359	$	3,243
Accounts receivable - ASC 842	9,385		9,802
Total Accounts Receivable	$	12,744	$	13,045
Less: Allowance for doubtful accounts	(1,150)		(1,161)
Total Accounts Receivable, net	$	11,594	$	11,884
Deferred income	$	693	$	1,103

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Inventory (Tables)

9 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Schedule of Inventory

Our inventory, net of allowance for obsolescence of $37,000 at September 30, 2021 and $221,000 at December 31, 2020, consisted of the following amounts:

	September 30, 2021		December 31, 2020
	(in thousands)
Raw materials - current	$	20,381	$	18,026
Work-in-process	1,011		1,900
Inventory - current	21,392		19,926
Raw materials - long term (net of allowances of $37 and $221, respectively)	1,250		1,065
Inventory - total	$	22,642	$	20,991

A summary of our inventory allowance is as follows:

	September 30, 2021		December 31, 2020
	(in thousands)
Beginning balance	$	(221)	$	(24)
Accruals	—		(251)
Write-offs	184		54
Ending balance	$	(37)	$	(221)

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Rental Equipment (Tables)

9 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

Schedule of Rental Equipment

Our rental equipment and associated accumulated depreciation as of September 30, 2021 and December 31, 2020, respectively, consisted of the following:

	September 30, 2021		December 31, 2020
	(in thousands)
Compressor units	$	397,426	$	379,623
Work-in-process	3,797		3,764
Rental equipment	401,223		383,387
Accumulated depreciation	(192,827)		(175,802)
Rental equipment, net of accumulated depreciation	$	208,396	$	207,585

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Stock-Based and Other Long-Term Incentive Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Summary of Option Activity

A summary of all option activity as of December 31, 2020, and changes during the nine months ended September 30, 2021 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, 2020	161,334	$	24.48	3.48	$	—
Granted	—	—		—	—
Cancelled / Forfeited	—	—		—	—
Expired	(16,000)	17.81		—	—
Outstanding, September 30, 2021	145,334	$	25.21	3.11	$	—
Exercisable, September 30, 2021	145,334	$	25.21	3.11	$	—

Summary of Stock Options Outstanding

The following table summarizes information about our stock options outstanding at September 30, 2021:

Range of Exercise Prices	Options Outstanding				Options Exercisable
	Shares	Weighted Average Remaining Contractual Life (years)	Weighted Average Exercise Price		Shares	Weighted Average Exercise Price
$0.01-18.00	8,500	0.32	$	14.89	8,500	$	14.89
$18.01-22.00	20,500	1.47	18.75		20,500	18.75
$22.01-26.00	42,167	3.53	22.90		42,167	22.90
$26.01-30.00	30,000	5.38	28.15		30,000	28.15
$30.01-34.00	44,167	2.47	30.41		44,167	30.41
	145,334	3.11	$	25.21	145,334	$	25.21

Summary of Restricted Stock Activity

A summary of all restricted stock/units outstanding as of December 31, 2020 and activity during the nine months ended September 30, 2021 is presented below:

	Number  of Shares	Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2020	258,101	$	12.87	1.61	$	2,447
Granted	156,339	8.93			1,406
Vested	(134,788)	14.94			1,258
Canceled/Forfeited	(3,333)	12.26			31
Outstanding, September 30, 2021	276,319	$	9.63	2.03	$	2,868

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(Loss) Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2021

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:

	Three months ended				Nine months ended
	September 30,				September 30,
	2021		2020		2021		2020
	(in thousands, except per share data)
Numerator:
Net (loss) income	$	(1,257)	$	(562)	$	(3,569)	$	3,685
Denominator for (loss) earnings per basic common share:
Weighted average common shares outstanding	13,121		13,248		13,225		13,214
Denominator for (loss) earnings per diluted common share:
Weighted average common shares outstanding	13,121		13,248		13,225		13,214
Dilutive effect of stock options and restricted stock/units	—		—		—		257
Diluted weighted average shares	13,121		13,248		13,225		13,471
(Loss) earnings per common share:
Basic	$	(0.10)	$	(0.04)	$	(0.27)	$	0.28
Diluted	$	(0.10)	$	(0.04)	$	(0.27)	$	0.27

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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenue from External Customer [Line Items]
Revenue	$ 18,245	$ 15,765	$ 54,391	$ 51,060
Revenue related to unsatisfied performance obligations	0		0
Uncertain tax position	$ 0		0
Sales
Revenue from External Customer [Line Items]
Revenue recognized			1,100		$ 533
Rental income
Revenue from External Customer [Line Items]
Revenue recognized			2		$ 73
Bill and Hold Arrangement
Revenue from External Customer [Line Items]
Revenue			$ 0	$ 852
Minimum
Revenue from External Customer [Line Items]
Amortization period of capitalized contract costs	1 year		1 year
Rental Contracts, Excluding Large Horsepower Compressors | Minimum
Revenue from External Customer [Line Items]
Rental contract term	6 months		6 months
Rental Contracts, Excluding Large Horsepower Compressors | Maximum
Revenue from External Customer [Line Items]
Rental contract term	24 months		24 months
Rental Contracts, Large Horsepower Compressors | Maximum
Revenue from External Customer [Line Items]
Rental contract term	60 months		60 months

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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2,050	$ 904	$ 7,242	$ 4,968
Rental income	16,195	14,861	47,149	46,092
Total revenue	18,245	15,765	54,391	51,060
Compressors - sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	1,891	2,211
Flares - sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	74	67	149	308
Other (parts/rebuilds) - sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,398	469	3,716	1,475
Service and maintenance
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 578	$ 368	$ 1,486	$ 974

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Summary of Significant Accounting Policies - Contract Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts Receivable
Accounts receivable - contracts with customers	$ 3,359	$ 3,243
Accounts receivable - ASC 842	9,385	9,802
Total Accounts Receivable	12,744	13,045
Less: Allowance for doubtful accounts	(1,150)	(1,161)
Total Accounts Receivable, net	11,594	11,884
Deferred income	$ 693	$ 1,103

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Inventory - Schedule of Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Allowance for obsolescence	$ 37	$ 221	$ 24
Raw materials - current	20,381	18,026
Work-in-process	1,011	1,900
Inventory - current	21,392	19,926
Raw materials - long term (net of allowances of $37 and $221, respectively)	1,250	1,065
Inventory - total	$ 22,642	$ 20,991

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Inventory - Schedule of Inventory Allowance (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Inventory Valuation Reserves [Roll Forward]
Beginning balance	$ (221)	$ (24)
Accruals	0	(251)
Write-offs	184	54
Ending balance	$ (37)	$ (221)

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Federal Income Tax Receivable - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Federal income tax receivable	$ 15,000	$ 11,538	$ 15,000	$ 11,538
Deferred tax liability increase due to tax law change		$ 0	$ 10,103
Income tax received refunds	$ 3,900

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Rental Equipment (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Rental equipment, gross	$ 401,223	$ 383,387
Accumulated depreciation	(192,827)	(175,802)
Rental equipment, net of accumulated depreciation	208,396	207,585
Impairment of rental equipment	0
Compressor units
Property, Plant and Equipment [Line Items]
Rental equipment, gross	397,426	379,623
Work-in-process
Property, Plant and Equipment [Line Items]
Rental equipment, gross	$ 3,797	$ 3,764

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Credit Facility (Details) - USD ($) $ in Thousands	May 11, 2021	Sep. 30, 2021	Dec. 31, 2020
Line of Credit Facility [Line Items]
Line of credit		$ 0	$ 417
Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit			417
Aggregate credit agreement commitment	$ 30,000		$ 30,000
Debt instrument, term	5 years
Borrowing base amount available	$ 20,000	20,000
Potential increase in borrowing capacity	30,000
Potential maximum borrowing capacity	$ 50,000
Borrowing base, component, percentage of eligible accounts receivable	90.00%
Percentage of eligible non investment grade decors	85.00%
Percentage of eligible inventory	50.00%
Line of credit facility, non exceeding cap of components	$ 2,000
Percentage of eligible compressors for extension of credit	95.00%
Term for depreciation	25 years
Percentage of net liquidation value of eligible compressors for extension of credit	80.00%
Percentage of eligible value at cost	80.00%
Unused commitment fee, rate	0.25%
Maximum leverage ratio allowed	3.00
Fixed charge coverage ratio	1.00
Outstanding balance		$ 0
Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Default trigger, certain defaults of other company indebtedness, amount	$ 1,000
Default trigger, rendering of certain judgments, amount	$ 1,000
Revolving Credit Facility | Federal Fund Rate
Line of Credit Facility [Line Items]
Variable rate, applicable margin	0.50%
Revolving Credit Facility | Euro Dollar Rate
Line of Credit Facility [Line Items]
Variable rate, applicable margin	1.00%
Revolving Credit Facility | Euro Dollar Rate | Minimum
Line of Credit Facility [Line Items]
Variable rate, applicable margin	1.25%
Revolving Credit Facility | Euro Dollar Rate | Maximum
Line of Credit Facility [Line Items]
Variable rate, applicable margin	1.75%
Revolving Credit Facility | Base Rate | Minimum
Line of Credit Facility [Line Items]
Variable rate, applicable margin	0.25%
Revolving Credit Facility | Base Rate | Maximum
Line of Credit Facility [Line Items]
Variable rate, applicable margin	0.75%

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Stock-Based and Other Long-Term Incentive Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Number  of Stock Options
Outstanding, beginning of period (in shares)	161,334
Granted (in shares)	0
Canceled/Forfeited (in shares)	0
Expired (in shares)	(16,000)
Outstanding, end of period (in shares)	145,334	161,334
Exercisable (in shares)	145,334
Weighted AverageExercise Price
Outstanding, beginning of period (in dollars per share)	$ 24.48
Granted (in dollars per share)	0
Canceled/Forfeited (in dollars per share)	0
Expired (in dollars per share)	17.81
Outstanding, end of period (in dollars per share)	25.21	$ 24.48
Exercisable (in dollars per share)	$ 25.21
WeightedAverageRemainingContractual Life (years)
Outstanding, weighted average remaining contractual life	3 years 1 month 9 days	3 years 5 months 23 days
Exercisable, weighted average remaining contractual life	3 years 1 month 9 days
AggregateIntrinsicValue(in thousands)
Outstanding, aggregate intrinsic value	$ 0	$ 0
Exercisable, aggregate intrinsic value	$ 0

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Stock-Based and Other Long-Term Incentive Compensation - Stock Options Outstanding (Details)	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, shares (in shares) | shares	145,334
Options outstanding, weighted average remaining contractual life (years)	3 years 1 month 9 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 25.21
Options exercisable, shares (in shares) | shares	145,334
Options exercisable, weighted average exercise price (in dollars per share)	$ 25.21
$0.01-18.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower limit (in dollars per share)	0.01
Range of exercise prices, upper limit (in dollars per share)	$ 18.00
Options outstanding, shares (in shares) | shares	8,500
Options outstanding, weighted average remaining contractual life (years)	3 months 25 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 14.89
Options exercisable, shares (in shares) | shares	8,500
Options exercisable, weighted average exercise price (in dollars per share)	$ 14.89
$18.01-22.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower limit (in dollars per share)	18.01
Range of exercise prices, upper limit (in dollars per share)	$ 22.00
Options outstanding, shares (in shares) | shares	20,500
Options outstanding, weighted average remaining contractual life (years)	1 year 5 months 19 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 18.75
Options exercisable, shares (in shares) | shares	20,500
Options exercisable, weighted average exercise price (in dollars per share)	$ 18.75
$22.01-26.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower limit (in dollars per share)	22.01
Range of exercise prices, upper limit (in dollars per share)	$ 26.00
Options outstanding, shares (in shares) | shares	42,167
Options outstanding, weighted average remaining contractual life (years)	3 years 6 months 10 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 22.90
Options exercisable, shares (in shares) | shares	42,167
Options exercisable, weighted average exercise price (in dollars per share)	$ 22.90
$26.01-30.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower limit (in dollars per share)	26.01
Range of exercise prices, upper limit (in dollars per share)	$ 30.00
Options outstanding, shares (in shares) | shares	30,000
Options outstanding, weighted average remaining contractual life (years)	5 years 4 months 17 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 28.15
Options exercisable, shares (in shares) | shares	30,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 28.15
$30.01-34.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower limit (in dollars per share)	30.01
Range of exercise prices, upper limit (in dollars per share)	$ 34.00
Options outstanding, shares (in shares) | shares	44,167
Options outstanding, weighted average remaining contractual life (years)	2 years 5 months 19 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 30.41
Options exercisable, shares (in shares) | shares	44,167
Options exercisable, weighted average exercise price (in dollars per share)	$ 30.41

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Stock-Based and Other Long-Term Incentive Compensation - Stock Option, Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock options (in shares)	0		0
Total unrecognized compensation expense	$ 0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 0	$ 18

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Stock-Based and Other Long-Term Incentive Compensation - Restricted Stock, Narrative (Details) $ in Thousands						9 Months Ended
	Jun. 17, 2022	Mar. 18, 2022	Jun. 17, 2021 shares	Apr. 01, 2021 shares	Mar. 18, 2021 independent_director shares	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense | $						$ 0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)						156,339
Share-based compensation expense | $						$ 1,300	$ 1,700
Total unrecognized compensation expense | $						$ 1,800
Recognition period						1 year 8 months 12 days
Restricted Stock | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					109,212
Award vesting period					3 years
Restricted Stock | Chief Financial Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			5,000		20,000
Restricted Stock | Vice President of Technical Services
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			5,000		20,000
Restricted Stock | Executive Officers | Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years	3 years
Restricted Stock | Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				5,291	5,612
Award vesting period					1 year
Number of independent directors | independent_director					3

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Stock-Based and Other Long-Term Incentive Compensation - Restricted Stock (Details) - Restricted Stock - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Number  of Shares
Outstanding, beginning of period (in shares)	258,101
Granted (in shares)	156,339
Vested (in shares)	(134,788)
Canceled/Forfeited (in shares)	(3,333)
Outstanding, beginning of period (in shares)	276,319	258,101
Weighted Average Grant Date Fair Value
Outstanding beginning of period (in dollars per share)	$ 12.87
Granted (in dollars per share)	8.93
Vested (in dollars per share)	14.94
Canceled/Forfeited (in dollars per share)	12.26
Outstanding ending of the period (in dollars per share)	$ 9.63	$ 12.87
Weighted Average Remaining Contractual Life (years)
Weighted average remaining contractual life (years)	2 years 10 days	1 year 7 months 9 days
Aggregate Intrinsic Value
Outstanding, begging balance	$ 2,447
Granted	1,406
Vested	1,258
Canceled/Forfeited	31
Outstanding, ending balance	$ 2,868	$ 2,447

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Stock-Based and Other Long-Term Incentive Compensation - Other Long-Term Incentive Compensation, Narrative (Details)				9 Months Ended
	Apr. 01, 2021 USD ($)	Mar. 18, 2021 USD ($) compressor	Apr. 28, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense				$ 0
Other Long-Term Incentive Compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		$ 973,080	$ 1,100,000
Award vesting period		3 years	3 years	1 year
Share-based compensation expense				$ 600,000	$ 252,000
Total unrecognized compensation expense				$ 1,400,000
Recognition period				2 years
Other Long-Term Incentive Compensation | Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	$ 50,000	$ 50,000	$ 50,000
Award vesting period			1 year
Number of independent directors | compressor		3

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(Loss) Earnings per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net (loss) income	$ (1,257)	$ (1,918)	$ (394)	$ (562)	$ 165	$ 4,082	$ (3,569)	$ 3,685
Denominator for (loss) earnings per basic common share:
Weighted average common shares outstanding (in shares)	13,121,000			13,248,000			13,225,000	13,214,000
Denominator for (loss) earnings per diluted common share:
Weighted average common shares outstanding (in shares)	13,121,000			13,248,000			13,225,000	13,214,000
Dilutive effect of stock options and restricted stock/units (in shares)	0			0			0	257,000
Diluted weighted average shares (in shares)	13,121,000			13,248,000			13,225,000	13,471,000
(Loss) earnings per common share:
Basic (in dollars per share)	$ (0.10)			$ (0.04)			$ (0.27)	$ 0.28
Diluted (in dollars per share)	$ (0.10)			$ (0.04)			$ (0.27)	$ 0.27
Restricted Stock
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)	276,319			262,781			276,319	10,774
Stock Options
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)	145,334			171,900			145,334	166,334

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Commitments and Contingencies (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2020	Aug. 12, 2019
Commitments and Contingencies Disclosure [Abstract]
Stock repurchase program, authorized amount	$ 10,000	$ 10,000		$ 10,000		$ 10,000
Purchase of treasury shares (in shares)				432,731
Purchase of treasury shares		$ 2,540	$ 1,892	$ 4,400
Average price (in dollars per share)	$ 10.46			$ 10.24
Treasury shares (in shares)	470,667	470,667		470,667	38,000
Treasury shares, at cost	$ 4,922	$ 4,922		$ 4,922	$ 490