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Consolidated Statements of Income and Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Revenue $ 48,637 $ 57,796 $ 57,909
Cost of goods sold 19,150 21,077 22,586
Gross profit 29,487 36,719 35,323
Operating expenses:      
Sales and marketing 10,032 10,646 11,227
Research and product development 8,584 8,318 8,969
General and administrative 7,325 7,493 7,152
Total operating expenses 25,921 26,457 27,348
Operating income 3,566 10,262 7,975
Other income, net 312 289 254
Income before income taxes 3,878 10,551 8,229
Provision for income taxes (1,434) (3,775) (2,633)
Net income $ 2,444 $ 6,776 $ 5,596
Basic earnings per common share $ 0.27 $ 0.74 $ 0.61
Diluted earnings per common share $ 0.26 $ 0.71 $ 0.58
Basic weighted average shares outstanding 9,021,980 9,127,385 9,166,769
Diluted weighted average shares outstanding 9,306,034 9,594,659 9,581,326
Comprehensive income:      
Net income $ 2,444 $ 6,776 $ 5,596
Other comprehensive income:      
Unrealized gain (loss) on available-for-sale securities, net of tax (1) (81) 14
Change in foreign currency translation adjustment (38) (77) (45)
Comprehensive income $ 2,405 $ 6,618 $ 5,565