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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue:    
Revenues $ 68,055 $ 78,444
Operating costs and expenses:    
Cost of rentals, exclusive of depreciation stated separately below 28,506 27,583
Cost of sales, exclusive of depreciation stated separately below 6,211 16,097
Cost of service and maintenance, exclusive of depreciation stated separately below 714 630
Selling, general and administrative expenses 10,550 10,710
Depreciation and amortization 25,198 23,268
Impairment of goodwill 0 10,039
Inventory allowance 184 3,758
Retirement of rental equipment 291 1,512
Total operating costs and expenses 71,654 93,597
Operating loss (3,599) (15,153)
Other income (expense):    
Interest expense (14) (15)
Other income 629 611
Total other income, net 615 596
Loss before income taxes: (2,984) (14,557)
(Provision for) benefit from income taxes:    
Current 15,438 31
Deferred (10,646) 662
Total income tax benefit 4,792 693
Net income (loss) $ 1,808 $ (13,864)
Earnings (loss) per share:    
Basic (in dollars per share) $ 0.14 $ (1.06)
Diluted (in dollars per share) $ 0.14 $ (1.06)
Weighted average shares outstanding:    
Basic (in shares) 13,224 13,114
Diluted (in shares) 13,261 13,114
Loss On Retirement of Rental Equipment    
Operating costs and expenses:    
Retirement of rental equipment $ 291 $ 1,512
Rental income    
Revenue:    
Revenues 60,826 56,701
Sales    
Revenue:    
Revenues 5,657 19,763
Service and maintenance income    
Revenue:    
Revenues $ 1,572 $ 1,980