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Condensed Income Statements (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Revenue:        
Rental income $ 20,177 $ 17,805 $ 58,431 $ 50,533
Sales, net 5,218 3,893 10,831 15,057
Service and maintenance income 204 167 611 516
Total revenue 25,599 21,865 69,873 66,106
Operating costs and expenses:        
Cost of rentals, exclusive of depreciation stated separately below 8,110 7,449 23,815 20,519
Cost of sales, exclusive of depreciation stated separately below 3,493 2,454 6,826 8,935
Cost of service and maintenance, exclusive of depreciation and amortization stated separately below 101 80 269 233
Selling, general, and administrative expense 2,527 2,142 7,860 6,023
Depreciation and amortization 5,528 4,652 15,816 13,326
Total operating costs and expenses 19,759 16,777 54,586 49,036
Operating income 5,840 5,088 15,287 17,070
Other income (expense):        
Interest expense (4) (3) (9) (45)
Other income 131 125 183 393
Total other income, net 127 122 174 348
Income before provision for income taxes 5,967 5,210 15,461 17,418
Provision for income taxes 2,084 1,816 5,337 6,185
Net income $ 3,883 $ 3,394 $ 10,124 $ 11,233
Earnings per share:        
Basic (in USD per share) $ 0.31 $ 0.28 $ 0.81 $ 0.91
Diluted (in USD per share) $ 0.30 $ 0.27 $ 0.80 $ 0.90
Weighted average shares outstanding:        
Basic (in shares) 12,461 12,339 12,424 12,313
Diluted (in shares) 12,740 12,600 12,728 12,504