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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Revenue $ 15,913 $ 15,739 $ 43,513 $ 42,558
Cost of goods sold 5,725 6,099 15,873 17,152
Gross profit 10,188 9,640 27,640 25,406
Operating expenses:        
Sales and marketing 2,752 2,791 8,126 8,504
Research and product development 2,132 2,314 6,128 6,886
General and administrative 1,796 1,571 5,686 5,251
Total operating expenses 6,680 6,676 19,940 20,641
Operating income 3,508 2,964 7,700 4,765
Other income, net 54 70 244 215
Income before income taxes 3,562 3,034 7,944 4,980
Provision for income taxes 1,145 1,440 2,740 2,018
Net income $ 2,417 $ 1,594 $ 5,204 $ 2,962
Basic earnings per common share $ 0.26 $ 0.17 $ 0.57 $ 0.32
Diluted earnings per common share $ 0.25 $ 0.17 $ 0.54 $ 0.31
Basic weighted average shares outstanding 9,139,329 9,198,730 9,119,925 9,182,875
Diluted weighted average shares outstanding 9,615,684 9,607,644 9,583,951 9,615,878
Other comprehensive income:        
Change in unrealized gains (losses) on available- for-sale securities, net of tax $ 17 $ (78) $ (5) $ 60
Change in foreign currency translation adjustment (8) 0 (59) 0
Comprehensive income $ 2,426 $ 1,516 $ 5,140 $ 3,022