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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net (loss) income $ (394) $ 4,082
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 6,297 6,240
Deferred income taxes 123 337
Stock-based compensation 474 502
Bad debt allowance 15 21
Gain on sale of assets 0 (68)
Loss (gain) on company owned life insurance (98) 262
Changes in operating assets and liabilities:    
Trade accounts receivables (855) (1,434)
Inventory (100) 1,616
Federal income tax receivable 0 (14,992)
Prepaid expenses and prepaid income taxes 301 344
Accounts payable and accrued liabilities 2,523 1,013
Deferred income (1,069) 550
Deferred tax liability increase due to tax law change 0 10,103
Other 164 (301)
NET CASH PROVIDED BY OPERATING ACTIVITIES 7,381 8,275
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of rental equipment, property and other equipment (4,965) (6,679)
Purchase of company owned life insurance (17) (54)
Proceeds from sale of property and equipment 0 68
NET CASH USED IN INVESTING ACTIVITIES (4,982) (6,665)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments of other long-term liabilities, net 0 (2)
Repayments of line of credit, net (417) 0
Taxes paid related to net share settlement of equity awards (224) (149)
NET CASH USED IN FINANCING ACTIVITIES (641) (151)
NET CHANGE IN CASH AND CASH EQUIVALENTS 1,758 1,459
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 28,925 11,592
CASH AND CASH EQUIVALENTS AT END OF PERIOD 30,683 13,051
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 1 3
Income taxes paid 0 40
NON-CASH TRANSACTIONS    
Right of use asset acquired through an operating lease $ 0 $ 4