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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 627 $ 3,800
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 10,638 10,940
Deferred income taxes (2,609) (770)
Stock-based compensation 2,416 1,186
Bad debt allowance 60 61
Inventory allowance 0 32
Gain on sale of assets (49) (25)
Gain on company owned life insurance (17) (4)
Changes in operating assets and liabilities:    
Trade accounts receivables 1,147 4,034
Inventory 450 3,179
Prepaid expenses and prepaid income taxes (1,411) (1,532)
Accounts payable and accrued liabilities 297 (1,430)
Deferred income (1,849) 286
Other 512 84
Tax benefit from equity compensation 0 (39)
NET CASH PROVIDED BY OPERATING ACTIVITIES 10,212 19,802
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (654) (2,618)
Purchase of company owned life insurance (529) (105)
Proceeds from sale of property and equipment 49 25
NET CASH USED IN INVESTING ACTIVITIES (1,134) (2,698)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments from other long-term liabilities, net (7) (6)
Proceeds from exercise of stock options 517 406
Taxes paid related to net share settlement of equity awards (644) (909)
Tax benefit from equity compensation 0 39
NET CASH USED IN FINANCING ACTIVITIES (134) (470)
NET CHANGE IN CASH AND CASH EQUIVALENTS 8,944 16,634
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 64,094 35,532
CASH AND CASH EQUIVALENTS AT END OF PERIOD 73,038 52,166
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 4 4
Income taxes paid 3,203 4,435
NON-CASH TRANSACTIONS    
Transfer of rental equipment components to inventory $ 48 $ 164