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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 426 $ 19,851 $ 6,469
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 22,049 21,302 21,796
Deferred taxes (5) (21,582) (2,713)
Gain on disposal of assets (69) (87) (86)
Loss on retirement of rental equipment 0 0 545
Bad debt allowance (185) 90 61
Inventory allowance 0 273 566
Stock based compensation 2,385 4,038 2,299
(Loss) Gain on company owned life insurance 154 (67) (14)
Changes in assets (increase) decrease in:      
Trade accounts receivables 1,500 (1,246) 1,668
Inventory (5,757) (5,350) 1,131
Prepaid income taxes and prepaid expenses (1,318) (1,806) (1,539)
Changes in liabilities increase (decrease) in:      
Accounts payable and accrued liabilities 3,597 3,410 (439)
Deferred income (104) (2,040) 1,954
Other 741 666 159
Tax benefit from equity compensation 0 0 (72)
NET CASH PROVIDED BY OPERATING ACTIVITIES 23,414 17,452 31,785
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of rental, property and equipment (39,790) (13,489) (3,321)
Purchase of company owned life insurance (289) (620) (194)
Proceeds from insurance claim 0 1,231 0
Proceeds from sale of property and equipment 69 87 101
NET CASH USED IN INVESTING ACTIVITIES (40,010) (12,791) (3,414)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds of other long-term liabilities (35) (23) (14)
Proceeds from exercise of stock options 680 1,120 1,042
Tax Benefit from equity compensation 0 0 72
Taxes paid related to net share settlement of equity awards (629) (644) (909)
NET CASH PROVIDED BY FINANCING ACTIVITIES 16 453 191
NET CHANGE IN CASH AND CASH EQUIVALENTS (16,580) 5,114 28,562
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 69,208 64,094 35,532
CASH AND CASH EQUIVALENTS AT END OF PERIOD 52,628 69,208 64,094
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:      
Interest paid 14 14 8
Income taxes paid 85 3,725 5,825
NON-CASH TRANSACTIONS      
Transfer of rental equipment to inventory $ 144 $ 55 $ 724