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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 472 $ 627
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 10,836 10,638
Deferred income taxes 170 (2,609)
Stock-based compensation 1,076 2,416
Bad debt allowance (102) 60
Gain on sale of assets (49) (49)
Loss (gain) on company owned life insurance 55 (17)
Changes in operating assets and liabilities:    
Trade accounts receivables (739) 1,147
Inventory 2,673 1,383
Prepaid expenses and prepaid income taxes 321 (1,411)
Accounts payable and accrued liabilities (4,327) 297
Deferred income 302 (1,849)
Other 172 512
NET CASH PROVIDED BY OPERATING ACTIVITIES 10,860 11,145
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of rental equipment and property and equipment (16,945) (1,587)
Purchase of company owned life insurance (191) (529)
Proceeds from sale of property and equipment 49 49
NET CASH USED IN INVESTING ACTIVITIES (17,087) (2,067)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments from other long-term liabilities, net (19) (7)
Proceeds from exercise of stock options 157 517
Taxes paid related to net share settlement of equity awards (629) (644)
NET CASH USED IN FINANCING ACTIVITIES (491) (134)
NET CHANGE IN CASH AND CASH EQUIVALENTS (6,718) 8,944
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 69,208 64,094
CASH AND CASH EQUIVALENTS AT END OF PERIOD 62,490 73,038
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 6 4
Income taxes paid 66 3,203
NON-CASH TRANSACTIONS    
Transfer of rental equipment components to inventory $ 144 $ 48