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Condensed Income Statements (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenue:        
Sales, net $ 10,649 $ 1,901 $ 23,080 $ 5,778
Rental income 13,671 11,601 27,409 22,482
Service and maintenance income 188 256 395 552
Total revenue 24,508 13,758 50,884 28,812
Operating costs and expenses:        
Cost of sales, exclusive of depreciation stated separately below 7,563 638 17,118 3,186
Cost of rentals, exclusive of depreciation stated separately below 5,874 4,909 11,383 9,271
Cost of service and maintenance, exclusive of depreciation stated separately below 98 93 191 231
Selling, general, and administrative expense 2,347 1,462 4,157 2,848
Depreciation and amortization 3,797 3,434 7,584 6,725
Total operating costs and expenses 19,679 10,536 40,433 22,261
Operating income 4,829 3,222 10,451 6,551
Other income (expense):        
Interest expense (3) (28) (5) (37)
Other income 61 45 99 753
Total other income 58 17 94 716
Income before provision for income taxes 4,887 3,239 10,545 7,267
Provision for income taxes 1,887 1,231 4,037 2,762
Net income $ 3,000 $ 2,008 $ 6,508 $ 4,505
Earnings per share:        
Basic $ 0.25 $ 0.16 $ 0.53 $ 0.37
Diluted $ 0.24 $ 0.16 $ 0.53 $ 0.37
Weighted average shares outstanding:        
Basic 12,216 12,179 12,177 12,157
Diluted 12,316 12,288 12,274 12,265