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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue $ 14,013 $ 14,111 $ 27,600 $ 26,819
Cost of goods sold 5,022 6,047 10,147 11,053
Gross profit 8,991 8,064 17,453 15,766
Operating expenses:        
Sales and marketing 2,753 2,976 5,375 5,713
Research and product development 2,054 2,330 3,996 4,571
General and administrative 1,891 1,712 3,890 3,680
Total operating expenses 6,698 7,018 13,261 13,964
Operating income 2,293 1,046 4,192 1,802
Other income, net 85 64 190 145
Income before income taxes 2,378 1,110 4,382 1,947
Provision for income taxes 863 228 1,595 578
Net income $ 1,515 $ 882 $ 2,787 $ 1,369
Basic earnings per common share $ 0.17 $ 0.10 $ 0.31 $ 0.15
Diluted earnings per common share $ 0.16 $ 0.09 $ 0.29 $ 0.14
Basic weighted average shares outstanding 9,119,907 9,266,071 9,110,062 9,174,816
Diluted weighted average shares outstanding 9,603,682 9,677,726 9,560,914 9,618,172
Other comprehensive income:        
Change in unrealized gains (losses) on available-for-sale securities, net of tax $ (77) $ 65 $ (23) $ 138
Change in foreign currency translation adjustment 129 0 (50) 0
Comprehensive income $ 1,567 $ 947 $ 2,714 $ 1,507