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Condensed Consolidated Income Statements (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue:        
Revenue $ 16,396 $ 15,913 $ 49,318 $ 51,033
Operating costs and expenses:        
Cost of rentals, exclusive of depreciation stated separately below 5,363 4,333 15,262 13,256
Cost of sales, exclusive of depreciation stated separately below 3,081 3,237 10,196 12,405
Cost of service and maintenance 107 90 273 288
Selling, general and administrative expense 2,353 2,340 6,683 7,776
Depreciation and amortization 5,536 5,320 16,372 15,958
Total operating costs and expenses 16,440 15,320 48,786 49,683
Operating (loss) income (44) 593 532 1,350
Other income (expense):        
Interest expense (4) (7) (10) (11)
Other income, net 184 (7) 189 (1)
Total other income (expense), net 180 (14) 179 (12)
Income before provision for income taxes 136 579 711 1,338
Income tax (benefit) expense (100) 57 3 189
Net income $ 236 $ 522 $ 708 $ 1,149
Earnings per share:        
Basic (in USD per share) $ 0.02 $ 0.04 $ 0.05 $ 0.09
Diluted (in USD per share) $ 0.02 $ 0.04 $ 0.05 $ 0.09
Weighted average shares outstanding:        
Basic (in shares) 12,977 12,838 12,953 12,825
Diluted (in shares) 13,254 13,117 13,228 13,102
Rental        
Revenue:        
Revenue $ 12,039 $ 11,292 $ 34,937 $ 34,634
Operating costs and expenses:        
Total operating costs and expenses 5,363 4,333 15,262 13,256
Other income (expense):        
Total other income (expense), net 0 0 0 0
Income before provision for income taxes 6,676 6,959 19,675 21,378
Sales        
Revenue:        
Revenue 3,947 4,256 13,328 15,300
Service & Maintenance        
Revenue:        
Revenue 410 365 1,053 1,099
Operating costs and expenses:        
Total operating costs and expenses 107 90 273 288
Other income (expense):        
Total other income (expense), net 0 0 0 0
Income before provision for income taxes $ 303 $ 275 $ 780 $ 811