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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Income Statement [Abstract] |  |
Revenue | $ 12,708 | $ 11,293
Cost of goods sold | 5,006 | 4,294
Gross profit | 7,702 | 6,999
Operating expenses: |  |
Sales and marketing | 2,736 | 2,267
Research and product development | 2,241 | 1,866
General and administrative | 1,964 | 1,797
Total operating expenses | 6,941 | 5,930
Operating income | 761 | 1,069
Other income (expense), net | 81 | (14)
Income before income taxes | 842 | 1,055
Provision for income taxes | 352 | 324
Net income | 490 | 731
Basic earnings per common share | $ 0.05 | $ 0.08
Diluted earnings per common share | $ 0.05 | $ 0.08
Basic weighted average shares outstanding | 9,082,546 | 9,152,859
Diluted weighted average shares outstanding | 9,558,941 | 9,394,181
Other comprehensive income: |  |
Unrealized gain (loss) on available-for-sale securities, net of tax | 96 | 0
Comprehensive income | $ 586 | $ 731

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