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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenue:        
Sales, net $ 3,893 $ 4,935 $ 15,057 $ 28,015
Rental income 17,805 14,120 50,533 41,529
Service and maintenance income 167 235 516 630
Total revenue 21,865 19,290 66,106 70,174
Operating costs and expenses:        
Cost of sales, exclusive of depreciation stated separately below 2,454 3,126 8,935 20,244
Cost of rentals, exclusive of depreciation stated separately below 7,449 5,896 20,519 17,279
Cost of service and maintenance, exclusive of depreciation stated separately below 80 88 233 279
Selling, general, and administrative expense 2,142 1,958 6,023 6,116
Depreciation and amortization 4,652 3,980 13,326 11,564
Total operating costs and expenses 16,777 15,048 49,036 55,482
Operating income 5,088 4,242 17,070 14,692
Other income (expense):        
Interest expense (3) (8) (45) (13)
Other income (expense) 125 (37) 393 62
Total other income (expense), net 122 (45) 348 49
Income before provision for income taxes 5,210 4,197 17,418 14,741
Provision for income taxes 1,816 1,591 6,185 5,627
Net income $ 3,394 $ 2,606 $ 11,233 $ 9,114
Earnings per share:        
Basic (in USD per share) $ 0.28 $ 0.21 $ 0.91 $ 0.75
Diluted (in USD per share) $ 0.27 $ 0.21 $ 0.90 $ 0.74
Weighted average shares outstanding:        
Basic (in shares) 12,339 12,230 12,313 12,214
Diluted (in shares) 12,600 12,331 12,504 12,312