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Condensed Income Statements - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Revenue:        
Rental income $ 18,491 $ 20,177 $ 58,806 $ 58,431
Sales, net 2,468 5,218 10,672 10,831
Service and maintenance income 234 204 686 611
Total revenue 21,193 25,599 70,164 69,873
Operating costs and expenses:        
Cost of rentals, exclusive of depreciation stated separately below 7,327 8,110 22,062 23,815
Cost of sales, exclusive of depreciation stated separately below 1,740 3,493 7,706 6,826
Cost of service and maintenance, exclusive of depreciation and amortization stated separately below 70 101 151 269
Loss on retirement of rental equipment (3) 0 4,370 0
Selling, general, and administrative expense 2,667 2,527 8,131 7,860
Depreciation and amortization 5,594 5,528 17,240 15,816
Total operating costs and expenses 17,395 19,759 59,660 54,586
Operating income 3,798 5,840 10,504 15,287
Other income (expense):        
Interest expense (7) (4) (13) (9)
Other income 20 131 67 183
Total other income, net 13 127 54 174
Income before provision for income taxes 3,811 5,967 10,558 15,461
Provision for income taxes 1,249 2,084 3,688 5,337
Net income $ 2,562 $ 3,883 $ 6,870 $ 10,124
Earnings per share:        
Basic (in USD per share) $ 0.20 $ 0.31 $ 0.55 $ 0.81
Diluted (in USD per share) $ 0.20 $ 0.30 $ 0.54 $ 0.80
Weighted average shares outstanding:        
Basic (in shares) 12,586 12,461 12,557 12,424
Diluted (in shares) 12,801 12,740 12,783 12,728