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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