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Condensed Income Statements (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Revenue:    
Sales, net $ 3,338 $ 7,835
Rental income 18,789 16,007
Service and maintenance income 195 141
Total revenue 22,322 23,983
Operating costs and expenses:    
Cost of sales, exclusive of depreciation stated separately below 2,235 4,882
Cost of rentals, exclusive of depreciation stated separately below 7,956 6,812
Cost of service and maintenance, exclusive of depreciation and amortization stated separately below 84 68
Selling, general, and administrative expense 2,643 1,846
Depreciation and amortization 5,042 4,238
Total operating costs and expenses 17,960 17,846
Operating income 4,362 6,137
Other income (expense):    
Interest expense (2) (30)
Other income 5 335
Total other income, net 3 305
Income before provision for income taxes 4,365 6,442
Provision for income taxes 1,509 2,448
Net income $ 2,856 $ 3,994
Earnings per share:    
Basic (in USD per share) $ 0.23 $ 0.33
Diluted (in USD per share) $ 0.23 $ 0.32
Weighted average shares outstanding:    
Basic (in shares) 12,373 12,282
Diluted (in shares) 12,692 12,379