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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net revenue:        
Rental $ 2,437 $ 2,447 $ 4,499 $ 4,895
Sales 7,589 5,948 14,471 10,133
Total net revenue 10,026 8,395 18,970 15,028
Cost of revenue:        
Rental 273 392 531 726
Sales 1,513 1,335 3,068 2,445
Total cost of revenue 1,786 1,727 3,599 3,171
Gross profit 8,240 6,668 15,371 11,857
Selling, general and administrative expense 7,308 5,769 13,953 11,097
Income from operations 932 899 1,418 760
Other income (expense):        
Interest income   1   1
Interest expense (81) (80) (174) (138)
Other income (expense) (7) 2 (7) 2
Total other income (expense) (88) (77) (181) (135)
Income before income tax 844 822 1,237 625
Income tax expense 371 338 444 251
Net income $ 473 $ 484 $ 793 $ 374
Net income per share:        
Basic $ 0.02 $ 0.02 $ 0.03 $ 0.01
Diluted $ 0.02 $ 0.02 $ 0.03 $ 0.01
Weighted average number of common shares outstanding:        
Basic 31,091,900 30,756,717 30,986,478 30,694,216
Diluted 31,249,107 31,025,478 31,142,876 30,957,206