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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 6,469 $ 10,147 $ 14,128
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 21,796 22,758 21,507
Deferred taxes (2,713) (1,846) 6,840
Gain on disposal of assets (86) (179) (160)
Loss on retirement of rental equipment 545 4,370 0
Bad debt allowance 61 477 121
Inventory allowance 566 205 395
Stock based compensation 2,299 3,545 3,244
Gain on company owned life insurance (14) 0 0
Changes in operating assets (increase) decrease in:      
Trade accounts receivables 1,668 824 (3,779)
Inventory 2,117 5,382 (6,112)
Prepaid income taxes and prepaid expenses (1,539) 5,774 (3,997)
Changes in operating liabilities increase (decrease) in:      
Accounts payable and accrued liabilities (439) (7,220) 1,126
Current income tax liability 0 (1,230) 920
Deferred income 1,954 (1,364) 762
Other 159 (32) (12)
Tax benefit from equity compensation (72) 0 (419)
NET CASH PROVIDED BY OPERATING ACTIVITIES 32,771 41,611 34,564
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchases of rental, property and equipment (4,307) (12,504) (53,342)
Purchase of company owned life insurance (194) 0 0
Proceeds from sale of property and equipment 101 189 240
NET CASH USED IN INVESTING ACTIVITIES (4,400) (12,315) (53,102)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Payments of other long-term liabilities, net (14) (26) (42)
Repayments of line of credit, net 0 0 (160)
Proceeds from exercise of stock options 1,042 776 59
Tax benefit from equity compensation 72 0 419
Taxes paid related to net share settlement of equity awards (909) (695) 0
NET CASH PROVIDED BY FINANCING ACTIVITIES 191 55 276
NET CHANGE IN CASH AND CASH EQUIVALENTS 28,562 29,351 (18,262)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 35,532 6,181 24,443
CASH AND CASH EQUIVALENTS AT END OF PERIOD 64,094 35,532 6,181
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:      
Interest paid 8 15 10
Income taxes paid 5,825 6,530 4,108
NON-CASH TRANSACTIONS      
Transfer of rental equipment to inventory 724 2,309 131
Transfer of inventory to property and equipment 0 1,624 0
Property and equipment purchases included in accounts payable $ 0 $ 0 $ 218