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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net (loss) income $ 1,808,000 $ (13,864,000)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 25,198,000 23,268,000
Deferred taxes 10,646,000 (662,000)
Gain on disposal of assets (284,000) (55,000)
Retirement of rental equipment 291,000 1,512,000
Bad debt allowance (recovery) 329,000 664,000
Inventory allowance 184,000 3,758,000
Impairment of goodwill 0 10,039,000
Stock-based compensation 2,195,000 2,582,000
(Gain) loss on company owned life insurance (168,000) (218,800)
Changes in operating assets and liabilities:    
Trade accounts receivables (3,107,000) (2,550,000)
Inventory 1,033,000 8,256,000
Prepaid income taxes and prepaid expenses (11,346,000) 3,288,000
Accounts payable and accrued liabilities 4,880,000 (7,225,000)
Deferred income 463,000 559,000
Other 527,000 61,000
NET CASH PROVIDED BY OPERATING ACTIVITIES 32,649,000 29,412,000
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of rental equipment, property and other equipment (15,257,000) (69,938,000)
Purchase of company owned life insurance (296,000) (302,000)
Proceeds from insurance claim 0 35,000
Proceeds from sale of property and equipment 394,000 30,000
NET CASH USED IN INVESTING ACTIVITIES (15,159,000) (70,175,000)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds of other long-term liabilities (5,000) (16,000)
Proceeds from exercise of stock options 0 506,000
Purchase of treasury shares 0 (490,000)
Taxes paid related to net share settlement of equity awards (152,000) (273,000)
NET CASH USED IN FINANCING ACTIVITIES (157,000) (273,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS 17,333,000 (41,036,000)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 11,592,000 52,628,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD 28,925,000 11,592,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 14,000 39,000
Income taxes paid 105,000 275,000
NON-CASH TRANSACTIONS    
Transfer of rental equipment to inventory 0 836,000
Transfer of inventory to rental equipment 0 1,184,000
Transfer of prepaids to rental equipment and inventory 0 958,000
Right of use asset acquired through an operating lease $ 77,000 $ 762,000