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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 10,147 $ 14,128 $ 14,390
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 22,758 21,507 18,144
Deferred taxes (1,846) 6,840 7,723
Gain on extinguishment of liability 0 0 (223)
Gain on disposal of assets (179) (160) (48)
Loss on retirement of rental equipment 4,370 0 0
Bad debt allowance 477 121 14
Inventory allowance 205 395 0
Stock based compensation 3,545 3,244 1,682
Changes in current assets (increase) decrease in:      
Trade accounts receivables 824 (3,779) (73)
Inventory 5,382 (6,112) (323)
Prepaid income taxes and prepaid expenses 5,774 (3,997) (1,870)
Changes in current liabilities increase (decrease) in:      
Accounts payable and accrued liabilities (7,220) 1,126 1,154
Current income tax liability (1,230) 920 (162)
Deferred income (1,364) 762 (1,154)
Other (32) (12) 0
Tax benefit from equity compensation 0 (419) (10)
NET CASH PROVIDED BY OPERATING ACTIVITIES 41,611 34,564 39,244
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchases of rental, property and equipment (12,504) (53,342) (43,419)
Proceeds from sale of property and equipment 189 240 95
NET CASH USED IN INVESTING ACTIVITIES (12,315) (53,102) (43,324)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Payments of other long-term liabilities, net (26) (42) (82)
Repayments of line of credit, net 0 (160) (320)
Proceeds from exercise of stock options 776 59 829
Tax benefit from equity compensation 0 419 10
Taxes paid related to net share settlement of equity awards (695) 0 0
NET CASH PROVIDED BY FINANCING ACTIVITIES 55 276 437
NET CHANGE IN CASH AND CASH EQUIVALENTS 29,351 (18,262) (3,643)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 6,181 24,443 28,086
CASH AND CASH EQUIVALENTS AT END OF PERIOD 35,532 6,181 24,443
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:      
Interest paid 15 10 56
Income taxes paid 6,530 4,108 2,590
NON-CASH TRANSACTIONS      
Transfer of rental equipment to inventory 2,309 131 207
Transfer of inventory to property and equipment 1,624 0 0
Property and equipment purchases included in accounts payable $ 0 $ 218 $ 251