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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 2,541 $ 3,694
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,503 5,788
Deferred income taxes 135 591
Stock based compensation 648 794
Bad debt allowance 29 160
Gain on sale of assets (25) (44)
Gain on company owned life insurance (3) 0
Changes in current assets and liabilities:    
Trade accounts receivables (1,769) 619
Inventory 2,791 5,146
Prepaid expenses 165 1,491
Accounts payable and accrued liabilities 68 (6,229)
Deferred income (86) (728)
Other 51 0
Tax benefit from equity compensation (15) 0
NET CASH PROVIDED BY OPERATING ACTIVITIES 10,033 11,282
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (1,942) (8,712)
Purchase of company owned life insurance (48) 0
Proceeds from sale of property and equipment 25 44
NET CASH USED IN INVESTING ACTIVITIES (1,965) (8,668)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments from other long-term liabilities, net (3) (7)
Proceeds from exercise of stock options 352 492
Taxes paid related to net share settlement of equity awards (909) (660)
Tax benefit from equity compensation 15 0
NET CASH USED IN FINANCING ACTIVITIES (545) (175)
NET CHANGE IN CASH AND CASH EQUIVALENTS 7,523 2,439
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 35,532 6,181
CASH AND CASH EQUIVALENTS AT END OF PERIOD 43,055 8,620
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 2 3
Income taxes paid 1,550 0
NON-CASH TRANSACTIONS    
Transfer of rental equipment components to inventory $ 164 $ 0