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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Revenue $ 13,033 $ 13,586
Cost of goods sold 4,568 5,124
Gross profit 8,465 8,462
Operating expenses:    
Sales and marketing 2,625 2,622
Research and product development 2,270 1,941
General and administrative 1,598 2,000
Total operating expenses 6,493 6,563
Operating income 1,972 1,899
Other income, net 11 104
Income before income taxes 1,983 2,003
Provision for income taxes 615 731
Net income $ 1,368 $ 1,272
Basic earnings per common share $ 0.15 $ 0.14
Diluted earnings per common share $ 0.14 $ 0.13
Basic weighted average shares outstanding 9,196,522 9,100,107
Diluted weighted average shares outstanding 9,513,440 9,508,479
Other comprehensive income:    
Unrealized gain on available-for-sale securities, net of tax $ 121 $ 55
Change in foreign currency translation adjustment 33 (180)
Comprehensive income $ 1,522 $ 1,147