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

Rental Equipment, Net

No definition available.

Name:	ngs_RentalEquipmentNet
Namespace Prefix:	ngs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).