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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue:    
Rental income $ 15,341 $ 16,100
Revenues 18,397 17,890
Operating costs and expenses:    
Cost of rentals, exclusive of depreciation stated separately below 7,156 7,897
Cost of sales, exclusive of depreciation stated separately below 2,616 1,739
Cost of service and maintenance, exclusive of depreciation stated separately below 48 125
Selling, general and administrative expenses 2,649 2,162
Depreciation and amortization 6,297 6,240
Total operating costs and expenses 18,766 18,163
Operating loss (369) (273)
Other income (expense):    
Interest expense (1) (3)
Other income (expense), net 101 (185)
Total other income (expense), net 100 (188)
Loss before provision for income taxes (269) (461)
Income tax (expense) benefit (125) 4,543
Net (loss) income $ (394) $ 4,082
(Loss) earnings per share:    
Basic (in dollars per share) $ (0.03) $ 0.31
Diluted (in dollars per share) $ (0.03) $ 0.30
Weighted average shares outstanding:    
Basic (in shares) 13,263 13,157
Diluted (in shares) 13,263 13,416
Sales    
Revenue:    
Revenues $ 2,711 $ 1,450
Service and maintenance income    
Revenue:    
Revenues $ 345 $ 340