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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 337 $ (394)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 6,061 6,297
Amortization of debt issuance costs 12 0
Deferred income tax (benefit) expense (11) 123
Stock-based compensation 423 474
Bad debt allowance 0 15
Gain on sale of assets (36) 0
Loss (gain) on company owned life insurance 130 (98)
Changes in operating assets and liabilities:    
Trade accounts receivables (2,494) (855)
Inventory 2,085 (100)
Prepaid expenses and prepaid income taxes 238 301
Accounts payable and accrued liabilities (349) 2,523
Deferred income (1,312) (1,069)
Other (89) 164
NET CASH PROVIDED BY OPERATING ACTIVITIES 4,995 7,381
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of rental equipment, property and other equipment (8,212) (4,965)
Purchase of company owned life insurance (47) (17)
Proceeds from sale of property and equipment 37 0
NET CASH USED IN INVESTING ACTIVITIES (8,222) (4,982)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments of other long-term liabilities, net (2) 0
Repayments of line of credit, net 0 (417)
Purchase of treasury shares (2,928) 0
Taxes paid related to net share settlement of equity awards (359) (224)
NET CASH USED IN FINANCING ACTIVITIES (3,289) (641)
NET CHANGE IN CASH AND CASH EQUIVALENTS (6,516) 1,758
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 22,942 28,925
CASH AND CASH EQUIVALENTS AT END OF PERIOD 16,426 30,683
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 12 1
NON-CASH TRANSACTIONS    
Right of use asset acquired through an operating lease $ 91 $ 0