0001084991-26-000043 | 10-Q | XBRL Viewer | Natural GAS Services Group INC

Schedule of Outstanding Long-Term Debt

Property and Equipment

The following table summarizes our property and non-rental equipment as of the dates presented:


	March 31,		December 31,
	2026		2025
Land	$	441	$	1,562
Building	4,613		16,703
Leasehold improvements	488		1,026
Office equipment and furniture	684		2,099
Software	52		619
Machinery and equipment	4,147		5,068
Vehicles	15,949		15,315
Work-in-progress	1,497		1,137
	27,871		43,529
Less accumulated depreciation	(15,877)		(23,010)
Total	$	11,994	$	20,519

Depreciation expense for property and equipment was $1.1 million and $0.9 million for the three months ended March 31, 2026, and 2025, respectively.

During the quarter ended March 31, 2026, we reclassified certain items of property and equipment attributable to our Former Headquarters Property with a carrying value of $8.8 million to assets held for sale (see Note 5).

Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Our outstanding long-term debt consists of the following, as of the dates presented:


	March 31,		December 31,
	2026		2025
Credit facility	$	226,000	$	230,000

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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Stock-Based and Other Long-Term Incentive Compensation - Schedule of Status of Unvested Stock Options (Details)	3 Months Ended
	Mar. 31, 2026 $ / shares shares
Shares
Unvested, beginning of period (in shares) \| shares	65,249
Granted (in shares) \| shares	21,500
Vested (in shares) \| shares	(11,834)
Cancelled/Forfeited (in shares) \| shares	(7,583)
Unvested, end of period (in shares) \| shares	67,332
Weighted Average Grant Date Fair Value Per Share
Unvested, beginning of period (in dollars per share) \| $ / shares	$ 11.97
Granted (in dollars per share) \| $ / shares	17.44
Vested (in dollars per share) \| $ / shares	12.00
Canceled/Forfeited (in dollars per share) \| $ / shares	12.23
Unvested, end of period (in dollars per share) \| $ / shares	$ 13.69

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2020
Operating Loss Carryforwards [Line Items]
Federal income tax receivable	$ 1,690	$ 14,056	$ 15,000
Tax Year 2019
Operating Loss Carryforwards [Line Items]
Federal income tax receivable	11,500
Income tax expense	1,800
Income tax refunds	1,500
Interest income	300
Tax Year 2015, 2016 And 2017
Operating Loss Carryforwards [Line Items]
Income tax expense	12,300
Income tax refunds	10,200
Interest income	$ 2,100

Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

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Long-Term Debt - Schedule of Outstanding Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Disclosure [Abstract]
Credit facility	$ 226,000	$ 230,000

Schedule of Trade Accounts Receivable

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Trade Accounts Receivable - Schedule of Provision for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 317	$ 1,249
Provision for credit losses	88	155
Write-offs	(15)	(1,087)
Ending balance	$ 390	$ 317

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Trade Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2026

Receivables [Abstract]

The following table summarizes our trade accounts receivable from customers as of the dates presented:


	March 31,		December 31,
	2026		2025
Trade accounts receivable
Rentals	$	20,678	$	16,565
Sales and aftermarket services	2,662		2,249
	23,340		18,814
Less: Provision for credit losses	(390)		(317)
Total trade accounts receivable, net	$	22,950	$	18,497

Schedule of Provision for Credit Losses

The following table summarizes the changes in our provision for credit losses for the periods presented:


	Three months ended		Year ended
	March 31,		December 31,
	2026		2025
Beginning balance	$	317	$	1,249
Provision for credit losses	88		155

Write-offs	(15)		(1,087)
Ending balance	$	390	$	317

Stock-Based and Other Long-Term Incentive Compensation

3 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement [Abstract]

Stock-Based and Other Long-Term Incentive Compensation

We maintain the stockholder-approved 2019 Equity Incentive Plan, as amended (the “Equity Incentive Plan”) for the issuance of stock-based compensation awards to our employees, certain consultants and Board of Director members. The Equity Incentive Plan provides for a total of 1,650,000 shares of common stock for issuance in the form of awards for: (i) stock options, (ii) stock appreciation rights, (iii) restricted awards in the form of restricted stock and restricted stock units (“RSUs”), (iv) performance share awards, including performance share units (“PSUs”) and (v) other equity-based awards. After consideration of the activity described in detail below, a total of 530,393 shares remained available for grant under the Equity Incentive Plan as of March 31, 2026. The Equity Incentive Plan expires on June 20, 2034. Until its expiration on February 28, 2026, we also maintained the 1998 Stock Option Plan, as amended (the “Stock Option Plan”) through which we issued stock options for all years prior to 2026.

The following table summarizes the total stock-based compensation expense recognized during the periods presented:


	Three months ended March 31,
		2026		2025
Equity-classified		$	579	$	359
Liability-classified (1)		138		—
		$	717	$	359

(1) Represents compensation expense associated with awards that may be settled in cash at the option of the grantee.

Stock Options

While the Stock Option Plan has expired, all stock options that were outstanding as of December 31, 2025 will remain subject to their vesting rights through their contractual lives. All options granted after 2025, including those indicated below, were granted under the Equity Incentive Plan. A summary of all option activity during the three months ended March 31, 2026 is presented below:


	Number of Shares Underlying Stock Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2025	111,168	$	21.28	7.27	$	1,375
Granted	21,500	$	36.17		$	49
Exercised	(2,000)	$	10.58		$	48
Canceled/Forfeited	(7,583)	$	22.59		$	96
Expired	—	$	—		$	—
Outstanding, March 31, 2026	123,085	$	23.98	7.24	$	1,694
Exercisable, March 31, 2026	55,753	$	20.82	5.61	$	943

The following table summarizes information about our stock options outstanding as of March 31, 2026:


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	17,501	6.11	$	10.85	15,835	$	10.96
$18.01-$26.00	67,834	8.60	$	22.50	23,668	$	22.38
$26.01-$30.00	37,750	6.03	$	32.72	16,250	$	28.15
	123,085	6.60	$	11.28	55,753	$	16.33

The following table summarizes changes in our unvested stock options during the three months ended March 31, 2026:


	Shares	Weighted Average Grant Date Fair Value Per Share
Unvested, December 31, 2025	65,249	$	11.97
Granted	21,500	$	17.44
Vested	(11,834)	$	12.00

Canceled/Forfeited	(7,583)	$	12.23
Unvested, March 31, 2026	67,332	$	13.69

As of March 31, 2026, there was a total of approximately $0.5 million of unrecognized compensation cost related to unvested options which is expected to be recognized over the next 2.09 years.

Time-Vested Restricted Stock and Restricted Stock Units

The following table summarizes all restricted stock and RSU activity during the three months ended March 31, 2026 is presented below:


	Number of Shares	Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2025	105,465	$	20.82	3.71	$	3,549
Granted	53,745	$	36.17		$	2,066
Vested	(36,082)	$	15.58		$	722
Canceled/Forfeited	—	$	—		$	—
Outstanding, March 31, 2026	123,128	$	27.57	5.84	$	5,225

As of March 31, 2026, there was a total of approximately $2.9 million of unrecognized compensation cost related to unvested restricted stock and RSUs which is expected to be recognized over the next 2.45 years.

Cash Settled Restricted Stock Units

The 2025 and 2024 grants of RSUs to the independent Board members that can be settled in cash represent liability-classified awards. Compensation expense associated with these awards is based upon the fair value of NGS common stock at each reporting period relative to that portion of the service period that has passed. Accordingly, the compensation expense is variable in nature.


	Number of Shares	Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2025	13,812	$	24.60	0.42	$	340
Granted	—	$	—		$	—
Vested	—	$	—		$	—
Canceled/Forfeited	—	$	—		$	—
Outstanding, March 31, 2026	13,812	$	24.60	0.12	$	340

Performance Share Units

The potential payout for the PSU awards is based upon performance for a three-year period ending December 31, 2026 for the 2024 grants, December 31, 2027 for the 2025 grants and December 31, 2028 for the 2026 grants measured against relative total shareholder return (“TSR”) compared to a peer group of companies as established by the Compensation Committee. The PSU award payout ranges from zero (if the Company ranks below the 31.25th percentile for the 2024 and 2025 grants and below the 30th percentile for the 2026 grant) and up to 200% (if the Company ranks first) based upon our relative TSR performance ranking (subject to certain caps based on absolute TSR as defined in the PSU agreements).

With respect to vesting, the PSUs have both a service condition and a market condition. Due to the presence of the TSR measurement for the common equity of the peer companies, including NGS common stock, which is deemed a “market condition,” the grant-date fair values of the PSUs have been determined using a binomial pricing model, or a Monte Carlo simulation model.


Weighted-average grant date fair value of PSUs granted	$	43.97
Risk free rate	3.74		%
Expected volatility	44.8		%

The following table summarizes all PSU activity during the three months ended March 31, 2026:


	Number of Shares	Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2025	78,181	$	24.90	1.64	$	—
Granted	41,113	$	43.97		$	—
Vested	—				$	—
Canceled/Forfeited	—				$	—
Outstanding, March 31, 2026	119,294	$	31.47	1.93	$	—

As of March 31, 2026, there was a total of approximately $2.8 million of unrecognized compensation cost related to the unvested portion of the PSUs which is expected to be recognized over the next 1.93 years.

Assets Held for Sale and Restructuring Activities (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2025 USD ($) employee	Dec. 31, 2025 USD ($)	Mar. 31, 2026 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairments		$ 8,800
Assets held for sale		$ 2,227	$ 10,986
Number of employees terminated \| employee	8
Severance costs	$ 100
Land and Building
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale			$ 2,200

Inventory (Tables)

3 Months Ended

Mar. 31, 2026

Inventory Disclosure [Abstract]

Schedule of Inventory

The following table summarizes the components of our inventory, net of allowance for obsolescence, as of the dates presented:


	March 31,		December 31,
	2026		2025
Parts and supplies, net of allowance of $2,552 for each period, respectively	$	21,185	$	20,104
Work-in-process	595		543
Inventory - current	21,780		20,647
Parts and supplies - long term, net of allowance of $1,020 for each period, respectively	—		—
Total inventory	$	21,780	$	20,647

The following table summarizes the changes in our allowance for obsolescence for the periods presented:


	March 31,		December 31,
	2026		2025
Beginning balance	$	3,572	$	5,867
Allowance for obsolescence	—		1,114
Write-offs	—		(3,409)
Ending balance	$	3,572	$	3,572

Property and Equipment - Schedule of Property and Non-Rental Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 27,871	$ 43,529
Less accumulated depreciation	(15,877)	(23,010)
Total	11,994	20,519
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	441	1,562
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,613	16,703
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	488	1,026
Office equipment and furniture
Property, Plant and Equipment [Line Items]
Property and equipment, gross	684	2,099
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	52	619
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,147	5,068
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,949	15,315
Work-in-progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,497	$ 1,137

Stockholders' Equity (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) $ / shares
Equity [Abstract]
Dividend per share (in dollars per share) \| $ / shares	$ 0.11
Dividends Paid \| $	$ 1,385

Stockholders' Equity

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

Dividends and Comprehensive Income

Cash dividends are considered restricted payments as defined in the Credit Facility (see N ote 9) and may be made provided that certain conditions are satisfied as reflected in the Credit Facility, including the absence of any defaults, among others. With respect to the dividends presented in the table below, all of the necessary conditions have been satisfied.

The following table summarizes our dividends declared and paid in cash for the periods presented:


Quarterly Period Ended	Dividends Declared per Share		Dividends Paid
March 31, 2026	$	0.11	$	1,385

Our comprehensive income is comprised only of our net income as there are no components that would be considered as other comprehensive income.

The entire disclosure for equity.

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-URI https://asc.fasb.org/505/tableOfContent

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-Topic 505
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-Topic 505
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-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2026
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income Taxes Receivable 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. We generated significant NOLs during 2018 and 2019 and filed carryback claims for these losses to the preceding five years. In connection with the filing of these claims, we initially recorded a federal income tax receivable of approximately $15.0 million and certain related adjustments to our deferred tax liability. We subsequently received federal income tax refunds corresponding to the 2018 NOL carryback during 2020 leaving approximately $11.5 million remaining to be refunded in connection with the 2019 NOL carryback. In conjunction with the remaining income tax refund claim, we received a notice from the Internal Revenue Service (“IRS”) on March 8, 2023, stating that our income tax returns for 2015, 2016, 2017 and 2019 were selected for examination. Furthermore, and as is customary for income tax refunds of this magnitude, the IRS was required to review the refund claim and provide a report to the Joint Committee on Taxation of the U.S. Congress (“JCT”). As a result of the submission of the refund claim to the JCT, the IRS completed their review of the income tax returns for 2015, 2016 and 2017. Our request for refund was reviewed and concluded favorably with the JCT concurring with the IRS’s conclusions. Subsequent to a delay due to the federal government shutdown in October 2025, we received a total of $12.3 million in the first quarter of 2026. This amount includes tax refunds of $10.2 million and related interest of $2.1 million for the years 2015, 2016 and 2017. After receipt of these refunds, a total of $1.8 million attributable solely to 2019 remains open including an income tax refund of $1.5 million plus interest of $0.3 million.

The entire disclosure for income tax.

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Revenue from Contract with Customer [Abstract]

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenue:
Rental	$ 47,115	$ 38,910
Total revenue	48,467	41,383
Cost of revenue (excluding depreciation and amortization):
Rental	17,090	14,840
Sales	624	2,016
Aftermarket services	505	271
Total cost of revenues (excluding depreciation and amortization)	18,219	17,127
Selling, general and administrative expense	6,508	5,378
Depreciation and amortization	10,325	8,636
Inventory allowance	0	61
Retirement of rental equipment	412	728
Gain on disposition of assets, net	(70)	(54)
Total operating costs and expenses	35,394	31,876
Operating income	13,073	9,507
Other income (expense):
Interest expense	(4,028)	(3,170)
Other income (expense)	(126)	(1)
Total other income (expense), net	(4,154)	(3,171)
Income before income taxes	8,919	6,336
Provision for income taxes	(2,156)	(1,482)
Net income	$ 6,763	$ 4,854
Earnings per share:
Basic (in dollars per share)	$ 0.54	$ 0.39
Diluted (in dollars per share)	$ 0.53	$ 0.38
Weighted average shares outstanding:
Basic (in shares)	12,584	12,462
Diluted (in shares)	12,746	12,611
Sales
Revenue:
Revenue from contract with customer, excluding assessed tax	$ 491	$ 1,927
Aftermarket services
Revenue:
Revenue from contract with customer, excluding assessed tax	$ 861	$ 546

Revenues from Customers

3 Months Ended

Mar. 31, 2026

Revenues from Customers

Disaggregation of Revenue

The following table summarizes our revenue disaggregated by product or service type for the periods presented:


	Three months ended March 31,
		2026		2025
Rental		$	47,115	$	38,910
Sales
Parts		392		1,019
Other (Compressors/Rebuilds)		99		908
		491		1,927
Aftermarket services		861		546
Total revenue		$	48,467	$	41,383

No amounts were recognized in revenue attributable to deferred revenue during the three months ended March 31, 2026 and 2025.

Transaction Price Allocated to the Remaining Performance Obligations

As of March 31, 2026, and December 31, 2025, we had no deferred revenue related to unsatisfied performance obligations.

Contract Costs

We recognize the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that we otherwise would have recognized is one year or less. These costs are included within Selling, general and administrative expenses in our Condensed Consolidated Statements of Operations.

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

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Inventory

3 Months Ended

Mar. 31, 2026

Inventory Disclosure [Abstract]

Inventory

The following table summarizes the components of our inventory, net of allowance for obsolescence, as of the dates presented:


	March 31,		December 31,
	2026		2025
Parts and supplies, net of allowance of $2,552 for each period, respectively	$	21,185	$	20,104
Work-in-process	595		543
Inventory - current	21,780		20,647
Parts and supplies - long term, net of allowance of $1,020 for each period, respectively	—		—
Total inventory	$	21,780	$	20,647

Our long-term inventory, which is fully reserved for obsolescence, consists of excess materials and supplies that remain viable but with limited market opportunities.

The following table summarizes the changes in our allowance for obsolescence for the periods presented:


	March 31,		December 31,
	2026		2025
Beginning balance	$	3,572	$	5,867
Allowance for obsolescence	—		1,114
Write-offs	—		(3,409)
Ending balance	$	3,572	$	3,572

The substantial write-off of the allowance for obsolescence during the year ended December 31, 2025 reflects the disposal of inventory items, including engines, frames and coolers, among other items that were previously held and reserved at our former fabrication, repair and overhaul facility in Midland, Texas (the (“Midland Facility”).

Cover - shares	3 Months Ended
Cover - shares	Mar. 31, 2026	May 08, 2026
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
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	601 State Street, Suite 400
Entity Address, City or Town	Southlake
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	76092
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	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		12,598,365
Entity Central Index Key	0001084991
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Amendment Flag	false

Revenues from Customers - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Rental	$ 47,115	$ 38,910
Total revenue	48,467	41,383
Parts
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	392	1,019
Other (Compressors/Rebuilds)
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	99	908
Sales
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	491	1,927
Aftermarket services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 861	$ 546

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Schedule of Dividends Declared

Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

The following table summarizes our dividends declared and paid in cash for the periods presented:


Quarterly Period Ended	Dividends Declared per Share		Dividends Paid
March 31, 2026	$	0.11	$	1,385

Assets Held for Sale and Restructuring Activities	3 Months Ended
Assets Held for Sale and Restructuring Activities	Mar. 31, 2026
Discontinued Operations and Disposal Groups [Abstract]
Assets Held for Sale and Restructuring Activities	Assets Held for Sale and Restructuring Activities As part of our broader efforts to monetize certain noncash assets, we began a process during 2025 to explore and ultimately pursue transactions to sell certain non-core real estate assets. These properties and the related restructuring actions are described below. The carrying value of these properties are reflected as assets held for sale and are included as a component of current assets on our Condensed Consolidated Balance Sheet. Former Headquarters Property In connection with our efforts to plan for an eventual sale of our former corporate headquarters facility including a building and land in Midland, Texas (the “Former Headquarters Property”), we undertook certain actions in the fourth quarter of 2025 to begin building-out a new leased office facility in Midland, Texas. We recorded an impairment during the fourth quarter of 2025 to reduce the carrying value of the Former Headquarters Property to its fair value, less costs to sell, or $8.8 million. In February 2026, we entered into an exclusive listing agreement to sell the Former Headquarters Property. Midland Facility During the second quarter of 2025, we completed all activities necessary to terminate operations at the Midland Facility and to begin marketing the facility for sale. The closure of the Midland Facility was part of our strategy to streamline and outsource our assembly operations and monetize company-owned real estate as disclosed previously. We are party to an exclusive listing agreement and are currently marketing the Midland Facility, which has a carrying value of $2.2 million. In connection with the complete closure of the Midland Facility, we terminated eight employees and incurred $0.1 million of severance and termination benefits all of which were paid and settled during April 2025. In addition, we disposed of all inventory items, including engines, frames and coolers, among other items that were fully reserved (see Note 4).

Revenues from Customers (Tables)

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

The following table summarizes our revenue disaggregated by product or service type for the periods presented:


	Three months ended March 31,
		2026		2025
Rental		$	47,115	$	38,910
Sales
Parts		392		1,019
Other (Compressors/Rebuilds)		99		908
		491		1,927
Aftermarket services		861		546
Total revenue		$	48,467	$	41,383

Description of Business	3 Months Ended
Description of Business	Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Natural Gas Services Group, Inc. (the “Company,” “NGS,” “Natural Gas Services Group,” “we,” “us” or “our”) (a Colorado corporation), is a leading provider of natural gas and electric compression equipment, technology and services to the energy industry. We rent, design, install, service and maintain compressors and related equipment and parts for our customers’ oil and gas production and processing facilities, generally using equipment from OEM suppliers along with limited in-house assembly. We are headquartered in Southlake, Texas, with administrative offices in Midland, Texas, an assembly facility located in Tulsa, Oklahoma and service facilities located in major oil and gas producing basins in the continental United States (“U.S.”).

Stock-Based and Other Long-Term Incentive Compensation - Restricted Stock Activity, Cash-Settled RSUs and Performance Share Units (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Restricted Stock
Number of Shares
Outstanding, beginning of period (in shares)	105,465
Granted (in shares)	53,745
Vested (in shares)	(36,082)
Canceled/Forfeited (in shares)	0
Outstanding, Ending of period (in shares)	123,128	105,465
Weighted Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share)	$ 20.82
Granted (in dollars per share)	36.17
Vested (in dollars per share)	15.58
Canceled/Forfeited (in dollars per share)	0
Outstanding, end of period (in dollars per share)	$ 27.57	$ 20.82
Weighted Average Remaining Contractual Life (years)
Weighted average remaining contractual life (years)	5 years 10 months 2 days	3 years 8 months 15 days
Aggregate Intrinsic Value
Outstanding, beginning of period aggregate intrinsic value	$ 3,549
Granted, aggregate intrinsic value	2,066
Vested, aggregate intrinsic value	722
Cancelled/Forfeited, aggregate intrinsic value	0
Outstanding, ending of period aggregate intrinsic value	$ 5,225	$ 3,549
Restricted Stock \| Cash-Settled RSUs
Number of Shares
Outstanding, beginning of period (in shares)	13,812
Granted (in shares)	0
Vested (in shares)	0
Canceled/Forfeited (in shares)	0
Outstanding, Ending of period (in shares)	13,812	13,812
Weighted Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share)	$ 24.60
Granted (in dollars per share)	0
Vested (in dollars per share)	0
Canceled/Forfeited (in dollars per share)	0
Outstanding, end of period (in dollars per share)	$ 24.60	$ 24.60
Weighted Average Remaining Contractual Life (years)
Weighted average remaining contractual life (years)	1 month 13 days	5 months 1 day
Aggregate Intrinsic Value
Outstanding, beginning of period aggregate intrinsic value	$ 340
Granted, aggregate intrinsic value	0
Vested, aggregate intrinsic value	0
Cancelled/Forfeited, aggregate intrinsic value	0
Outstanding, ending of period aggregate intrinsic value	$ 340	$ 340
PSUs
Number of Shares
Outstanding, beginning of period (in shares)	78,181
Granted (in shares)	41,113
Vested (in shares)	0
Canceled/Forfeited (in shares)	0
Outstanding, Ending of period (in shares)	119,294	78,181
Weighted Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share)	$ 24.90
Granted (in dollars per share)	43.97
Outstanding, end of period (in dollars per share)	$ 31.47	$ 24.90
Weighted Average Remaining Contractual Life (years)
Weighted average remaining contractual life (years)	1 year 11 months 4 days	1 year 7 months 20 days
Aggregate Intrinsic Value
Outstanding, beginning of period aggregate intrinsic value	$ 0
Granted, aggregate intrinsic value	0
Vested, aggregate intrinsic value	0
Cancelled/Forfeited, aggregate intrinsic value	0
Outstanding, ending of period aggregate intrinsic value	$ 0	$ 0

Earnings per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Numerator for basic and diluted earnings per share:
Net income	$ 6,763	$ 4,854
Denominator for basic earnings per common share:
Weighted average common shares outstanding - Basic (in shares)	12,584	12,462
Denominator for diluted earnings per common share:
Weighted average common shares outstanding (in shares)	12,584	12,462
Dilutive effect of stock-based compensation awards (in shares)	162	149
Weighted average common shares outstanding - Diluted (in shares)	12,746	12,611
Earnings per common share:
Basic (in dollars per share)	$ 0.54	$ 0.39
Diluted (in dollars per share)	$ 0.53	$ 0.38

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 6,763	$ 4,854
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,325	8,636
Inventory allowance	0	61
Retirement of rental equipment	412	728
Gain on disposition of assets, net	(70)	(54)
Amortization of debt issuance costs	325	212
Deferred income taxes	2,123	1,450
Stock-based compensation	579	359
Provision for credit losses	88	208
Loss on company owned life insurance	125	17
Changes in operating assets and liabilities:
Trade accounts receivables	(4,541)	3
Inventory	(1,133)	647
Prepaid expenses, income taxes receivable and prepayments	10,710	64
Accounts payable and accrued liabilities	(1,380)	4,617
Other	(1,291)	(535)
NET CASH PROVIDED BY OPERATING ACTIVITIES	23,035	21,267
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of rental equipment, property and other equipment	(15,247)	(19,256)
Proceeds from disposition of assets, net	37	0
NET CASH USED IN INVESTING ACTIVITIES	(15,210)	(19,256)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from credit facility borrowings	9,000	6,000
Repayments of credit facility borrowings	(13,000)	(8,000)
Payments of debt issuance costs	(1)	0
Proceeds from exercise of stock options	67	0
Payment of dividends	(1,385)	0
Taxes paid related to net share settlement of equity awards	(195)	(6)
NET CASH USED IN FINANCING ACTIVITIES	(5,514)	(2,006)
NET CHANGE IN CASH AND CASH EQUIVALENTS	2,311	5
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0	2,142
CASH AND CASH EQUIVALENTS AT END OF PERIOD	2,311	2,147
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid, net of amounts capitalized	3,653	2,936
Income taxes paid, net of refunds received	(10,196)	16
NON-CASH TRANSACTIONS:
Transfer of property and equipment to assets held for sale	8,759	0
Accrued purchases of property and equipment	$ 228	$ 524

CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Mar. 31, 2026	Dec. 31, 2025
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)	13,907,000	13,883,000
Treasury shares (in shares)	1,310,000	1,310,000

Inventory - Schedule of Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Inventory Disclosure [Abstract]
Allowance for inventory obsolescence, current	$ 2,552	$ 2,552
Parts and supplies, net of allowance of $2,552 for each period, respectively	21,185	20,104
Work-in-process	595	543
Inventory - current	21,780	20,647
Allowance for inventory obsolescence, noncurrent	1,020	1,020
Parts and supplies - long term, net of allowance of $1,020 for each period, respectively	0	0
Total inventory	$ 21,780	$ 20,647

Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2026

Schedule of Property and Non-Rental Equipment

The following table summarizes our rental equipment and accumulated depreciation as of the dates presented:


	March 31,		December 31,
	2026		2025
Compressor units	$	719,988	$	712,693
Work-in-progress	18,511		24,894
	738,499		737,587
Accumulated depreciation	(235,472)		(239,062)
Rental equipment, net of accumulated depreciation	$	503,027	$	498,525

The following table summarizes our property and non-rental equipment as of the dates presented:


	March 31,		December 31,
	2026		2025
Land	$	441	$	1,562
Building	4,613		16,703
Leasehold improvements	488		1,026
Office equipment and furniture	684		2,099
Software	52		619
Machinery and equipment	4,147		5,068
Vehicles	15,949		15,315
Work-in-progress	1,497		1,137
	27,871		43,529
Less accumulated depreciation	(15,877)		(23,010)
Total	$	11,994	$	20,519

Property and Equipment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Property, Plant and Equipment [Line Items]
Assets held for sale	$ 10,986		$ 2,227
Property, Plant, and Equipment, Excluding Rental Equipment
Property, Plant and Equipment [Line Items]
Depreciation	1,100	$ 900
Land and Building
Property, Plant and Equipment [Line Items]
Assets held for sale	2,200
Land and Building \| Midland Texas
Property, Plant and Equipment [Line Items]
Assets held for sale	$ 8,800

Rental Equipment - Narrative (Details) $ in Millions	3 Months Ended
Rental Equipment - Narrative (Details) $ in Millions	Mar. 31, 2026 USD ($) unit horsepower	Mar. 31, 2025 USD ($) unit horsepower
Property, Plant and Equipment [Line Items]
Rental equipment units retired \| unit	134	68
Rental equipment horsepower retired \| horsepower	17,700	12,073
Property, plant and equipment, disposals	$ 0.4	$ 0.7
Capitalized interest	0.2	0.6
Rental Equipment
Property, Plant and Equipment [Line Items]
Depreciation expenses	$ 9.2	$ 7.7

Rental Equipment - Schedule of Rental Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Property, Plant and Equipment [Line Items]
Rental equipment	$ 738,499	$ 737,587
Accumulated depreciation	(235,472)	(239,062)
Rental equipment, net of accumulated depreciation	503,027	498,525
Compressor units
Property, Plant and Equipment [Line Items]
Rental equipment	719,988	712,693
Work-in-progress
Property, Plant and Equipment [Line Items]
Rental equipment	$ 18,511	$ 24,894

Stock-Based and Other Long-Term Incentive Compensation - Valuation Assumptions (Details)	3 Months Ended
	Mar. 31, 2026 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of PSUs granted (in dollars per share)	$ 17.44
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of PSUs granted (in dollars per share)	$ 43.97
Risk free rate	3.74%
Expected volatility	44.80%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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, 2024		0
Beginning balance at Dec. 31, 2024	$ 255,057	$ 0	$ 138	$ 118,415	$ 151,508	$ (15,004)
Beginning balance (in shares) at Dec. 31, 2024			13,762,000
Beginning balance (in shares) at Dec. 31, 2024						1,310,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	359			359
Vesting of restricted stock/units (in shares)			22,000
Vesting of restricted stock/units	0
Taxes paid related to net shares settlement of equity awards	(6)			(6)
Net income	4,854				4,854
Ending balance (in shares) at Mar. 31, 2025		0
Ending balance at Mar. 31, 2025	$ 260,264	$ 0	$ 138	118,768	156,362	$ (15,004)
Ending balance (in shares) at Mar. 31, 2025			13,784,000
Ending balance (in shares) at Mar. 31, 2025						1,310,000
Beginning balance (in shares) at Dec. 31, 2025	0	0
Beginning balance at Dec. 31, 2025	$ 274,716	$ 0	$ 138	120,811	168,771	$ (15,004)
Beginning balance (in shares) at Dec. 31, 2025	13,883,000		13,883,000
Beginning balance (in shares) at Dec. 31, 2025	1,310,000					1,310,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 579			579
Vesting of restricted stock/units (in shares)			23,000
Vesting of restricted stock/units	$ 0
Exercise of common stock options (in shares)	2,000		2,000
Exercise of common stock options	$ 67		$ 1	66
Taxes paid related to net shares settlement of equity awards (in shares)			(1,000)
Taxes paid related to net shares settlement of equity awards	(195)			(195)
Dividends declared	(1,396)				(1,396)
Net income	$ 6,763				6,763
Ending balance (in shares) at Mar. 31, 2026	0	0
Ending balance at Mar. 31, 2026	$ 280,534	$ 0	$ 139	$ 121,261	$ 174,138	$ (15,004)
Ending balance (in shares) at Mar. 31, 2026	13,907,000		13,907,000
Ending balance (in shares) at Mar. 31, 2026	1,310,000					1,310,000

Rental Equipment (Tables)

3 Months Ended

Mar. 31, 2026

Schedule of Rental Equipment

The following table summarizes our rental equipment and accumulated depreciation as of the dates presented:


	March 31,		December 31,
	2026		2025
Compressor units	$	719,988	$	712,693
Work-in-progress	18,511		24,894
	738,499		737,587
Accumulated depreciation	(235,472)		(239,062)
Rental equipment, net of accumulated depreciation	$	503,027	$	498,525

The following table summarizes our property and non-rental equipment as of the dates presented:


	March 31,		December 31,
	2026		2025
Land	$	441	$	1,562
Building	4,613		16,703
Leasehold improvements	488		1,026
Office equipment and furniture	684		2,099
Software	52		619
Machinery and equipment	4,147		5,068
Vehicles	15,949		15,315
Work-in-progress	1,497		1,137
	27,871		43,529
Less accumulated depreciation	(15,877)		(23,010)
Total	$	11,994	$	20,519

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and ContingenciesFrom time to time, we are a party to various claims and legal proceedings arising from our operations in the ordinary course of business. We are not currently a party to any material legal proceedings, and we are not aware of any threatened material litigation. While the outcome of any potential claims and legal proceedings against us cannot be predicted with certainty, we have concluded that it is not considered reasonably possible that a loss resulting from any such claims or proceedings in excess of any amounts accrued has been incurred that is expected to have a material adverse effect on our financial condition, results of operations or cash flows. Furthermore, we believe that we maintain adequate insurance coverage against any potential litigation loss relating to insurable risks.

Inventory - Schedule of Inventory Allowance (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Inventory Valuation Reserves [Roll Forward]
Beginning balance	$ 3,572	$ 5,867
Allowance for obsolescence	0	1,114
Write-offs	0	(3,409)
Ending balance	$ 3,572	$ 3,572

Supplemental Balance Sheet Disclosures

3 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Balance Sheet Disclosures

The following table summarizes the components of accrued liabilities as of the dates presented:


	March 31,		December 31,
	2026		2025
Accrued purchases	$	6,355	$	4,960
Compensation	3,632		3,121
Right of use obligations	471		462
Interest	267		273

Sales taxes	433		421
Professional fees	439		426
Other	251		799
	$	11,848	$	10,462

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2026
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On May 11, 2026, we announced that our Board of Directors declared a cash dividend of $0.15 per share to stockholders of record as of May 20, 2026 expected to be paid on June 3, 2026. We have evaluated all events subsequent to the balance sheet date as of March 31, 2026, and through the date this report was issued and determined that there have been no other events that would require adjustments or additional disclosures to our Condensed Consolidated Financial Statements.

Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2026

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 earnings per share computation for the periods presented:


	Three months ended March 31,
		2026		2025
Numerator for basic and diluted earnings per share:
Net income		$	6,763	$	4,854
Denominator for basic earnings per common share:
Weighted average common shares outstanding - Basic		12,584		12,462
Denominator for diluted earnings per common share:
Weighted average common shares outstanding		12,584		12,462
Dilutive effect of stock-based compensation awards		162		149
Weighted average common shares outstanding - Diluted		12,746		12,611
Earnings per common share:
Basic		$	0.54	$	0.39
Diluted		$	0.53	$	0.38

Schedule of Determination of Diluted Earnings Per Share

The following table summarizes the actual number of stock-based compensation awards that were excluded from the determination of diluted earnings per share due to their anti-dilutive effect for the periods presented:


	Three months ended March 31,
		2026	2025
Stock options		21,500	96,500
Restricted stock and RSUs		—	7,595
PSUs		41,113	—
		62,613	104,095

Trade Accounts Receivable -Schedule of Trade Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Trade accounts receivable
Trade accounts receivable	$ 23,340	$ 18,814
Less: Provision for credit losses	(390)	(317)
Total trade accounts receivable, net	22,950	18,497
Rentals
Trade accounts receivable
Trade accounts receivable	20,678	16,565
Sales and aftermarket services
Trade accounts receivable
Trade accounts receivable	$ 2,662	$ 2,249

Trade Accounts Receivable - Narrative (Details) - Oxy And Devon - Customer Concentration Risk	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Sales Revenue, Goods, Net and Rental Income
Concentration Risk [Line Items]
Concentration risk, percentage	64.00%	55.00%
Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	63.00%		62.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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-Name Accounting Standards Codification
-Section 50
-Paragraph 18
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 7: http://www.xbrl.org/2003/role/exampleRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References + Details

Earnings per Share

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Earnings per Share

The following table reconciles the numerators and denominators of the basic and diluted earnings per share computation for the periods presented:


	Three months ended March 31,
		2026		2025
Numerator for basic and diluted earnings per share:
Net income		$	6,763	$	4,854
Denominator for basic earnings per common share:
Weighted average common shares outstanding - Basic		12,584		12,462
Denominator for diluted earnings per common share:
Weighted average common shares outstanding		12,584		12,462
Dilutive effect of stock-based compensation awards		162		149
Weighted average common shares outstanding - Diluted		12,746		12,611
Earnings per common share:
Basic		$	0.54	$	0.39
Diluted		$	0.53	$	0.38


	Three months ended March 31,
		2026	2025
Stock options		21,500	96,500
Restricted stock and RSUs		—	7,595
PSUs		41,113	—
		62,613	104,095

Stock-Based and Other Long-Term Incentive Compensation - Schedule of Stock Options Outstanding (Details)	3 Months Ended
	Mar. 31, 2026 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, shares (in shares) \| shares	123,085
Options outstanding, weighted average remaining contractual life (years)	6 years 7 months 6 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 11.28
Options exercisable, shares (in shares) \| shares	55,753
Options exercisable, weighted average exercise price (in dollars per share)	$ 16.33
$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	17,501
Options outstanding, weighted average remaining contractual life (years)	6 years 1 month 9 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 10.85
Options exercisable, shares (in shares) \| shares	15,835
Options exercisable, weighted average exercise price (in dollars per share)	$ 10.96
$18.01-$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)	18.01
Range of exercise prices, upper limit (in dollars per share)	$ 26.00
Options outstanding, shares (in shares) \| shares	67,834
Options outstanding, weighted average remaining contractual life (years)	8 years 7 months 6 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 22.50
Options exercisable, shares (in shares) \| shares	23,668
Options exercisable, weighted average exercise price (in dollars per share)	$ 22.38
$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	37,750
Options outstanding, weighted average remaining contractual life (years)	6 years 10 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 32.72
Options exercisable, shares (in shares) \| shares	16,250
Options exercisable, weighted average exercise price (in dollars per share)	$ 28.15

Subsequent Events (Details) - $ / shares		3 Months Ended
Subsequent Events (Details) - $ / shares	May 11, 2026	Mar. 31, 2026
Subsequent Event [Line Items]
Dividend per share (in dollars per share)		$ 0.11
Subsequent Event
Subsequent Event [Line Items]
Dividend per share (in dollars per share)	$ 0.15

Rental Equipment

3 Months Ended

Mar. 31, 2026

Rental Equipment

The following table summarizes our rental equipment and accumulated depreciation as of the dates presented:


	March 31,		December 31,
	2026		2025
Compressor units	$	719,988	$	712,693
Work-in-progress	18,511		24,894
	738,499		737,587
Accumulated depreciation	(235,472)		(239,062)
Rental equipment, net of accumulated depreciation	$	503,027	$	498,525

We evaluated our rental equipment for potential impairments as of March 31, 2026, and December 31, 2025 and determined that none were present. We retired 134 and 68 units representing 17,700 and 12,073 horsepower, with remaining carrying values of $0.4 million and $0.7 million during the three months ended March 31, 2026 and 2025, respectively. Depreciation expense for rental equipment was $9.2 million and $7.7 million for the three months ended March 31, 2026, and 2025, respectively. We capitalized interest totaling approximately $0.2 million and $0.6 million, for the three months ended March 31, 2026, and 2025, respectively.

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current Assets:
Cash and cash equivalents	$ 2,311	$ 0
Trade accounts receivable, net of provision for credit losses	22,950	18,497
Inventory, net of allowance for obsolescence	21,780	20,647
Income taxes receivable and prepayments	1,690	14,056
Prepaid expenses and other	3,352	1,696
Assets held for sale	10,986	2,227
Total current assets	63,069	57,123
Long-term inventory, net of allowance for obsolescence	0	0
Rental equipment, net of accumulated depreciation	503,027	498,525
Property and equipment, net of accumulated depreciation	11,994	20,519
Other assets	10,825	10,619
Total assets	588,915	586,786
Current Liabilities:
Accounts payable	11,486	14,048
Accrued liabilities	11,848	10,462
Total current liabilities	23,334	24,510
Long-term debt	226,000	230,000
Deferred income taxes	54,653	52,530
Other long-term liabilities	4,394	5,030
Total liabilities	308,381	312,070
Commitments and contingencies (Note 11)
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; 13,907 and 13,883 shares issued, respectively	139	138
Additional paid-in capital	121,261	120,811
Retained earnings	174,138	168,771
Treasury shares, at cost, 1,310 shares for each of the dates presented, respectively	(15,004)	(15,004)
Total stockholders’ equity	280,534	274,716
Total liabilities and stockholders’ equity	$ 588,915	$ 586,786

Stock-Based and Other Long-Term Incentive Compensation - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Number of Shares Underlying Stock Options
Outstanding, beginning of period (in shares)	111,168
Granted (in shares)	21,500
Exercised (in shares)	(2,000)
Canceled/Forfeited (in shares)	(7,583)
Expired (in shares)	0
Outstanding, end of period (in shares)	123,085	111,168
Exercisable (in shares)	55,753
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 21.28
Granted (in dollars per share)	36.17
Exercised (in dollars per share)	10.58
Canceled/Forfeited (in dollars per share)	22.59
Expired (in dollars per share)	0
Outstanding, end of period (in dollars per share)	23.98	$ 21.28
Exercisable (in dollars per share)	$ 20.82
Weighted Average Remaining Contractual Life (years)
Outstanding, weighted average remaining contractual life	7 years 2 months 26 days	7 years 3 months 7 days
Exercisable, weighted average remaining contractual life	5 years 7 months 9 days
Aggregate Intrinsic Value
Outstanding, aggregate intrinsic value	$ 1,694	$ 1,375
Granted, aggregate intrinsic value	49
Exercised, aggregate intrinsic value	48
Canceled/Forfeited, aggregate intrinsic value	96
Expired, aggregate intrinsic value	0
Exercisable, aggregate intrinsic value	$ 943

Long-Term Debt

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Long-Term Debt

Our outstanding long-term debt consists of the following, as of the dates presented:


	March 31,		December 31,
	2026		2025
Credit facility	$	226,000	$	230,000

We have a senior secured revolving credit agreement, as amended (the “Credit Facility”) with Texas Capital Bank, National Association as administrative agent (the “Administrative Agent”), TCBI Securities, Inc., Bank of America, N.A., and the Huntington National Bank as joint lead arrangers and joint book runners, and the lenders party thereto (the “Lenders”).

The Credit Facility provides for a total commitment of $400.0 million. We also have a right to request from the Lenders an increase to the potential aggregate commitment of up to $100.0 million; provided, however, the aggregate commitment amount is not permitted to exceed $500.0 million. The accordion feature is subject to certain conditions, including the absence of a default, the consent of new or existing lenders willing to provide additional commitments, and our pro forma compliance with the Credit Facility’s financial covenants. The obligations under the Credit Facility are secured by a first priority lien on most of our assets, including inventory and certain accounts receivable as well as a variable number of our leased compressor units. The maturity date of the Credit Facility is February 28, 2028.

As of March 31, 2026, we had $226.0 million outstanding under our Credit Facility with a weighted average interest rate of 6.79%. As of March 31, 2026, we had approximately $174.0 million available for borrowing under the Credit Facility, subject to a borrowing base determination. As of March 31, 2026, we were in compliance with all financial covenants in our Credit Facility.

Borrowing Base. At any time before the maturity of the Credit Facility, 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) 85% of eligible accounts receivable owed to us, plus (b) 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 $2.5 million, plus (c) the lesser of (i) 95% of the net book value of the compressors that the Administrative Agent 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 Administrative Agent 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 (d) 80% of the net book value, valued at the lower of cost (excluding any costs for capitalized interest or other noncash capitalized costs) or market of the eligible new compressor fleet, minus (e) any required availability reserves determined by the Administrative Agent in its sole discretion. The Administrative Agent may adjust the borrowing base components if material deviations in the collateral are discovered in future audits of the collateral.

Interest and Fees. Under the terms of the Credit Facility, 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 Term Secured Overnight Financing Rate (“SOFR”) Loan, the Adjusted Term SOFR 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 Term SOFR 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 Administrative Agent for each fiscal quarter from time to time pursuant to the Credit Facility. Depending on the leverage ratio, the Applicable Margin can be 1.50% to 2.25% for Base Rate Loans (as defined in the Credit Facility) and 2.50% to 3.25% for Term SOFR 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 Credit Facility is in effect at an annual rate equal to 0.375% of the unused commitment amount. Accrued interest is payable monthly on outstanding principal amounts and unused commitment fee, provided that accrued interest on Term SOFR Loans is payable at the end of each interest period, but in no event less frequently than quarterly.

Covenants. The Credit Facility 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 are subject to certain financial covenants in the Credit Facility that require us to maintain (i) a leverage ratio, as defined, less than or equal to 3.50 to 1.00 for each fiscal quarter and (ii) a fixed charge coverage ratio greater than or equal to 1.25 to 1.00 as of the last day of each fiscal quarter.

Events of Default and Acceleration. The Credit Facility 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 Facility 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. Obligations outstanding under the Credit Facility may be accelerated upon the occurrence of an event of default.

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

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