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Consolidated Statements Of Comprehensive Income (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Consolidated Statements Of Comprehensive Income [Abstract]    
Net sales $ 1,702 $ 1,534
Cost of goods sold 732 642
Gross profit 970 892
Operating expenses:    
Selling and marketing 389 395
General and administrative 351 298
Research and development 165 118
Total operating expenses 905 811
Operating income 65 81
Non-operating income (expense):    
Interest expense (2) 0
Gain on sale of available-for-sale securities 547 103
Interest income 1 2
Other income 4 3
Total non-operating income 550 108
Income before income taxes 615 189
Income taxes 215 23
Net income 400 166
Other comprehensive income (loss):    
Change in unrealized value of available-for-sale securities, net of income tax (52) (271)
Reclassification of gains included in net income, net of income tax (339) (64)
Net change in other comprehensive income (loss) (391) (335)
Net comprehensive income (loss) $ 9 $ (169)
Basic    
Net income per share $ 0.12 $ 0.04
Weighted average shares 3,395,503 3,393,655
Diluted    
Net income per share $ 0.11 $ 0.04
Weighted average shares 3,642,094 3,415,635
Dividends paid per common share $ 0.00 $ 0.04