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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 357 $ 225
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Depreciation and amortization 5,558 5,387
Deferred income taxes 157 48
Stock-based compensation 495 428
Bad debt (recovery) allowance 10 (50)
Gain on sale of assets (22) 0
(Gain) loss on company owned life insurance (99) 67
Changes in operating assets and liabilities:    
Trade accounts receivables (3,089) 865
Inventory (4,468) 15
Prepaid expenses and prepaid income taxes 202 488
Accounts payable and accrued liabilities (3,074) (2,539)
Deferred income 52 109
Other 75 85
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES (3,846) 5,128
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of rental equipment and property and equipment (9,130) (8,712)
Purchase of company owned life insurance (40) (139)
Proceeds from sale of property and equipment 11 0
Proceeds from insurance claims of property and equipment 11 0
NET CASH USED IN INVESTING ACTIVITIES (9,148) (8,851)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments from other long-term liabilities, net (5) (9)
Proceeds from exercise of stock options 555 157
Taxes paid related to net share settlement of equity awards (192) (495)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES 358 (347)
NET CHANGE IN CASH AND CASH EQUIVALENTS (12,636) (4,070)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 52,628 69,208
CASH AND CASH EQUIVALENTS AT END OF PERIOD 39,992 65,138
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 4 3
Income taxes paid 2 0
NON-CASH TRANSACTIONS    
Transfer of rental equipment components to inventory 0 40
Transfer of prepaids to rental equipment and inventory 574 $ 0
Right of use acquired through an operating lease $ 126