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Income Statements (USD $)
In Thousands, except Per Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Revenue:        
Sales, net $ 1,901 $ 1,779 $ 5,778 $ 3,241
Rental income 11,601 9,902 22,482 19,777
Service and maintenance income 256 220 552 433
Total revenue 13,758 11,901 28,812 23,451
Operating costs and expenses:        
Cost of sales, exclusive of depreciation stated separately below 638 1,137 3,186 2,128
Cost of rentals, exclusive of depreciation stated separately below 4,909 3,792 9,271 7,596
Cost of service and maintenance, exclusive of depreciation stated separately below 93 152 231 306
Selling, general, and administrative expense 1,462 1,522 2,848 3,020
Depreciation and amortization 3,434 2,905 6,725 5,779
Total operating costs and expenses 10,536 9,508 22,261 18,829
Operating income 3,222 2,393 6,551 4,622
Other income (expense):        
Interest expense (28) (53) (37) (127)
Other income (expense) 45 66 753 43
Total other income (expense) 17 13 716 (84)
Income before provision for income taxes 3,239 2,406 7,267 4,538
Provision for income taxes 1,231 862 2,762 1,630
Net income $ 2,008 $ 1,544 $ 4,505 $ 2,908
Earnings per share:        
Basic $ 0.16 $ 0.13 $ 0.37 $ 0.24
Diluted $ 0.16 $ 0.13 $ 0.37 $ 0.24
Weighted average shares outstanding:        
Basic 12,179 12,104 12,157 12,103
Diluted 12,288 12,205 12,265 12,203