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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net (loss) income $ (2,313) $ 4,247
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 12,623 12,541
Amortization of debt issuance costs 7 0
Deferred income taxes (224) 399
Stock-based compensation 896 1,066
Bad debt allowance 65 63
Gain on sale of assets 0 (273)
Loss (gain) on company owned life insurance (188) 92
Changes in operating assets and liabilities:    
Trade accounts receivables (410) (2,631)
Inventory (1,543) 5,262
Federal income tax receivable 0 (14,992)
Prepaid expenses and prepaid income taxes (369) (95)
Accounts payable and accrued liabilities 4,281 (536)
Deferred income (410) (515)
Deferred tax liability increase due to tax law change 0 10,103
Other 337 71
NET CASH PROVIDED BY OPERATING ACTIVITIES 12,752 14,802
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of rental equipment, property and other equipment (12,567) (10,989)
Purchase of company owned life insurance (55) (196)
Proceeds from sale of property and equipment 0 383
Proceeds from sale of deferred compensation mutual fund 0 10
NET CASH USED IN INVESTING ACTIVITIES (12,622) (10,792)
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 (1,892) 0
Taxes paid related to net share settlement of equity awards (335) (149)
NET CASH USED IN FINANCING ACTIVITIES (2,882) (151)
NET CHANGE IN CASH AND CASH EQUIVALENTS (2,752) 3,859
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 28,925 11,592
CASH AND CASH EQUIVALENTS AT END OF PERIOD 26,173 15,451
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 9 11
Income taxes paid 0 63
NON-CASH TRANSACTIONS    
Right of use asset acquired through an operating lease $ 0 $ 5