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Unaudited Condensed Consolidated Statements of Operations (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
Revenue $ 11,573 $ 11,511 $ 33,382 $ 34,102
Cost of goods sold 4,856 4,534 13,464 13,666
Gross profit 6,717 6,977 19,918 20,436
Operating expense:        
Sales and marketing 1,821 2,184 6,209 6,274
Research and product development 1,959 1,796 5,996 5,249
General and administrative 1,545 1,333 4,736 4,166
Proceeds from litigation 0 (3,702) (250) (3,702)
Total operating expenses 5,325 1,611 16,691 11,987
Operating income 1,392 5,366 3,227 8,449
Other income (expense), net 29 (4) 40 15
Income before income taxes 1,421 5,362 3,267 8,464
Provision for income taxes 492 1,987 1,310 2,956
Net income $ 929 $ 3,375 $ 1,957 $ 5,508
Basic earnings per common share: (in dollars per share) $ 0.10 $ 0.37 $ 0.21 $ 0.61
Diluted earnings per common share: (in dollars per share) $ 0.10 $ 0.36 $ 0.21 $ 0.59
Basic weighted average shares (in shares) 9,113,713 9,089,919 9,106,455 9,005,221
Diluted weighted average shares (in shares) 9,193,574 9,358,292 9,219,161 9,276,619