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Condensed Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue:    
Rental income $ 11,471 $ 11,922
Sales 2,998 6,637
Service and maintenance income 249 343
Total revenue 14,718 18,902
Operating costs and expenses:    
Cost of rentals, exclusive of depreciation stated separately below 4,704 4,668
Cost of sales, exclusive of depreciation stated separately below 2,191 5,423
Cost of service and maintenance 65 94
Selling, general and administrative expense 2,021 3,046
Depreciation and amortization 5,387 5,328
Total operating costs and expenses 14,368 18,559
Operating income 350 343
Other income (expense):    
Interest expense (3) (2)
Other (expense) income , net (73) 3
Total other (expense) income, net (76) 1
Income before provision for income taxes 274 344
Provision for income taxes 49 92
Net income $ 225 $ 252
Earnings per share:    
Basic (in USD per share) $ 0.02 $ 0.02
Diluted (in USD per share) $ 0.02 $ 0.02
Weighted average shares outstanding:    
Basic (in shares) 12,920 12,804
Diluted (in shares) 13,169 13,056