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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 252 $ 2,541
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,328 5,503
Deferred income taxes (1,266) 135
Stock-based compensation 1,532 648
Bad debt allowance 60 29
Gain on sale of assets (27) (25)
Gain on company owned life insurance (12) (3)
Changes in operating assets and liabilities:    
Trade accounts receivables 2,637 (1,769)
Inventory 1,981 2,791
Prepaid expenses 1,930 165
Accounts payable and accrued liabilities 68 68
Deferred income (1,741) (86)
Other 43 51
Tax benefit from equity compensation 0 (15)
NET CASH PROVIDED BY OPERATING ACTIVITIES 10,785 10,033
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (464) (1,942)
Purchase of company owned life insurance (93) (48)
Proceeds from sale of property and equipment 27 25
NET CASH USED IN INVESTING ACTIVITIES (530) (1,965)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments from other long-term liabilities, net (4) (3)
Proceeds from exercise of stock options 517 352
Taxes paid related to net share settlement of equity awards (492) (909)
Tax benefit from equity compensation 0 15
NET CASH PROVIDED BY/(USED IN) FINANCING ACTIVITIES 21 (545)
NET CHANGE IN CASH AND CASH EQUIVALENTS 10,276 7,523
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 64,094 35,532
CASH AND CASH EQUIVALENTS AT END OF PERIOD 74,370 43,055
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 2 2
Income taxes paid 0 1,550
NON-CASH TRANSACTIONS    
Transfer of rental equipment components to inventory $ 48 $ 164