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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 4,082 $ 98
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 6,240 5,577
Deferred income taxes 337 68
Stock-based compensation 502 495
Bad debt allowance 21 10
Gain on sale of assets (68) (22)
Loss (gain) on company owned life insurance 262 (99)
Changes in operating assets and liabilities:    
Trade accounts receivables (1,434) (3,089)
Inventory 1,616 (3,986)
Federal income tax receivable (14,992) 0
Prepaid expenses and prepaid income taxes 344 149
Accounts payable and accrued liabilities 1,013 (3,074)
Deferred income 550 52
Deferred tax liability increase due to tax law change 10,103 0
Other (301) 75
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES 8,275 (3,746)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of rental equipment and property and equipment (6,679) (9,230)
Purchase of company owned life insurance (54) (40)
Proceeds from sale of property and equipment 68 11
Proceeds from insurance claims of property and equipment 0 11
NET CASH USED IN INVESTING ACTIVITIES (6,665) (9,248)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments from other long-term liabilities, net (2) (5)
Proceeds from exercise of stock options 0 555
Taxes paid related to net share settlement of equity awards (149) (192)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES (151) 358
NET CHANGE IN CASH AND CASH EQUIVALENTS 1,459 (12,636)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 11,592 52,628
CASH AND CASH EQUIVALENTS AT END OF PERIOD 13,051 39,992
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 3 4
Income taxes paid 40 2
NON-CASH TRANSACTIONS    
Transfer of prepaids to rental equipment and inventory 0 574
Right of use acquired through an operating lease $ 4 $ 126