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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net (loss) income $ (13,864,000) $ (466,000) $ 19,794,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:      
Depreciation and amortization 23,268,000 22,080,000 21,316,000
Deferred taxes (662,000) 314,000 (21,575,000)
Gain on disposal of assets (55,000) (69,000) (87,000)
Retirement of rental equipment 1,512,000 0 0
Bad debt allowance (recovery) 664,000 (185,000) 90,000
Inventory allowance 3,758,000 0 273,000
Impairments 10,039,000 0 0
Stock-based compensation 2,582,000 2,385,000 4,038,000
(Gain) loss on company owned life insurance (218,800) 153,900 (67,000)
Changes in operating assets and liabilities:      
Trade accounts receivables (2,550,000) 1,500,000 (1,246,000)
Inventory 8,256,000 (5,102,000) (5,221,000)
Prepaid income taxes and prepaid expenses 3,288,000 (578,000) (1,852,000)
Changes in operating assets and liabilities:      
Accounts payable and accrued liabilities (7,225,000) 3,597,000 3,410,000
Deferred income 559,000 (104,000) (2,040,000)
Other 61,000 163,000 666,000
NET CASH PROVIDED BY OPERATING ACTIVITIES 29,412,000 23,689,000 17,499,000
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of rental equipment, property and other equipment (69,938,000) (40,065,000) (13,536,000)
Purchase of company owned life insurance (302,000) (289,000) (620,000)
Proceeds from insurance claim 35,000 0 1,231,000
Proceeds from sale of property and equipment 30,000 69,000 87,000
NET CASH USED IN INVESTING ACTIVITIES (70,175,000) (40,285,000) (12,838,000)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds of other long-term liabilities (16,000) (35,000) (23,000)
Proceeds from exercise of stock options 506,000 680,000 1,120,000
Purchase of treasury shares (490,000) 0 0
Taxes paid related to net share settlement of equity awards (273,000) (629,000) (644,000)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES (273,000) 16,000 453,000
NET CHANGE IN CASH AND CASH EQUIVALENTS (41,036,000) (16,580,000) 5,114,000
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 52,628,000 69,208,000 64,094,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD 11,592,000 52,628,000 69,208,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:      
Interest paid 39,000 14,000 14,000
Income taxes paid 275,000 85,000 3,725,000
NON-CASH TRANSACTIONS      
Transfer of rental equipment to inventory 836,000 144,000 55,000
Transfer of inventory to rental equipment 1,184,000 0 0
Transfer of prepaids to rental equipment and inventory 958,000 $ 0 $ 0
Right of use asset acquired through an operating lease $ 762,000