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Condensed Income Statements (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Revenue:    
Sales, net $ 7,835 $ 12,432
Rental income 16,007 13,738
Service and maintenance income 141 206
Total revenue 23,983 26,376
Operating costs and expenses:    
Cost of sales, exclusive of depreciation stated separately below 4,882 9,555
Cost of rentals, exclusive of depreciation stated separately below 6,812 5,509
Cost of service and maintenance, exclusive of depreciation stated separately below 68 93
Selling, general, and administrative expense 1,846 1,810
Depreciation and amortization 4,238 3,787
Total operating costs and expenses 17,846 20,754
Operating income 6,137 5,622
Other income (expense):    
Interest expense (30) (3)
Other income (expense) 335 39
Total other income (expense) 305 36
Income before provision for income taxes 6,442 5,658
Provision for income taxes 2,448 2,150
Net income $ 3,994 $ 3,508
Earnings per share:    
Basic (in USD per share) $ 0.33 $ 0.29
Diluted (in USD per share) $ 0.32 $ 0.29
Weighted average shares outstanding:    
Basic (in shares) 12,282 12,169
Diluted (in shares) 12,379 12,262