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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net revenue:        
Rental $ 2,281 $ 2,482 $ 6,780 $ 7,377
Sales 7,821 6,945 22,292 17,078
Total net revenue 10,102 9,427 29,072 24,455
Cost of revenue:        
Rental 279 465 810 1,191
Sales 1,937 1,470 5,005 3,915
Total cost of revenue 2,216 1,935 5,815 5,106
Gross profit 7,886 7,492 23,257 19,349
Selling, general and administrative expense 7,174 6,389 21,127 17,486
Income from operations 712 1,103 2,130 1,863
Other income (expense):        
Interest income       1
Interest expense (119) (87) (293) (225)
Other income (expense) (6)   (13) 2
Total other income (expense) (125) (87) (306) (222)
Income before income tax 587 1,016 1,824 1,641
Income tax expense (229) (425) (673) (676)
Net income $ 358 $ 591 $ 1,151 $ 965
Net income per share:        
Basic $ 0.01 $ 0.02 $ 0.04 $ 0.03
Diluted $ 0.01 $ 0.02 $ 0.04 $ 0.03
Weighted average number of common shares outstanding:        
Basic 31,130,908 30,794,268 31,034,972 30,727,720
Diluted 31,316,836 31,013,012 31,202,842 30,977,933