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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 225 $ 252
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,387 5,328
Deferred income taxes 48 (1,266)
Stock-based compensation 428 1,532
Bad debt allowance (50) 60
Gain on sale of assets 0 (27)
Loss (gain) on company owned life insurance 67 (12)
Changes in operating assets and liabilities:    
Trade accounts receivables 865 2,637
Inventory 15 1,661
Prepaid expenses and prepaid income taxes 488 1,930
Accounts payable and accrued liabilities (2,539) 68
Deferred income 109 (1,741)
Other 85 43
NET CASH PROVIDED BY OPERATING ACTIVITIES 5,128 10,465
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of rental equipment and property and equipment (8,712) (144)
Purchase of company owned life insurance (139) (93)
Proceeds from sale of property and equipment 0 27
NET CASH USED IN INVESTING ACTIVITIES (8,851) (210)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments from other long-term liabilities, net (9) (4)
Proceeds from exercise of stock options 157 517
Taxes paid related to net share settlement of equity awards (495) (492)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES (347) 21
NET CHANGE IN CASH AND CASH EQUIVALENTS (4,070) 10,276
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 69,208 64,094
CASH AND CASH EQUIVALENTS AT END OF PERIOD 65,138 74,370
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 3 2
Income taxes paid 0 0
NON-CASH TRANSACTIONS    
Transfer of rental equipment components to inventory $ 40 $ 48