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Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenue:      
Sales, net $ 36,375 $ 15,419 $ 12,370
Rental income 56,477 48,619 40,670
Service and maintenance income 870 1,120 868
Total revenue 93,722 65,158 53,908
Operating costs and expenses:      
Cost of sales, exclusive of depreciation stated separately below 25,816 9,194 8,010
Cost of rentals, exclusive of depreciation stated separately below 23,737 20,742 16,205
Cost of service and maintenance, exclusive of depreciation stated separately below 354 458 535
Selling, general, and administrative expense 7,893 5,910 5,867
Depreciation and amortization 15,707 13,994 11,927
Total operating costs and expenses 73,507 50,298 42,544
Operating income 20,215 14,860 11,364
Other income (expense):      
Interest expense (18) (55) (194)
Other income (expense) 14 824 130
Total other income (expense) (4) 769 (64)
Income before provision for income taxes 20,211 15,629 11,300
Provision for income taxes:      
Current 554 75 24
Deferred taxes 6,972 5,794 4,248
Provision for income taxes 7,526 5,869 4,272
Net income $ 12,685 $ 9,760 $ 7,028
Earnings per common share:      
Net income per share - Basic $ 1.04 $ 0.80 $ 0.58
Net income per share - Diluted $ 1.03 $ 0.80 $ 0.58
Weighted average shares outstanding:      
Basic (in shares) 12,220 12,148 12,108
Diluted (in shares) 12,320 12,250 12,210