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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue:    
Revenues $ 17,890 $ 17,991
Operating costs and expenses:    
Cost of rentals, exclusive of depreciation stated separately below 7,897 6,220
Cost of sales, exclusive of depreciation stated separately below 1,739 3,699
Cost of service and maintenance, exclusive of depreciation stated separately below 125 147
Selling, general and administrative expenses 2,162 2,493
Depreciation and amortization 6,240 5,577
Total operating costs and expenses 18,163 18,136
Operating loss (273) (145)
Other income (expense):    
Interest expense (3) (4)
Other (expense) income, net (185) 305
Total other (expense) income, net (188) 301
(Loss) income before provision for income taxes (461) 156
Income tax benefit (expense) 4,543 (58)
Net income $ 4,082 $ 98
Earnings per share:    
Basic (in USD per share) $ 0.31 $ 0.01
Diluted (in USD per share) $ 0.30 $ 0.01
Weighted average shares outstanding:    
Basic (in shares) 13,157 13,064
Diluted (in shares) 13,416 13,268
Rental [Member]    
Revenue:    
Revenues $ 16,100 $ 13,387
Sales    
Revenue:    
Revenues 1,450 4,125
Service and maintenance    
Revenue:    
Revenues $ 340 $ 479