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Consolidated Statements Of Comprehensive Income (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Consolidated Statements Of Comprehensive Income [Abstract]        
Net sales $ 1,917 $ 1,708 $ 5,379 $ 4,813
Cost of goods sold 770 727 2,246 2,042
Gross profit 1,147 981 3,133 2,771
Operating expenses:        
Selling and marketing 409 378 1,197 1,163
General and administrative 327 444 971 1,026
Research and development 186 144 567 374
Total operating expenses 922 966 2,735 2,563
Operating income 225 15 398 208
Non-operating income (expense):        
Interest expense (5) 0 (12) 0
Gain on sale of available-for-sale securities 258 129 1,008 530
Interest income 0 3 2 5
Other income 3 3 11 11
Total non-operating income 256 135 1,009 546
Income before income taxes 481 150 1,407 754
Provision for income taxes 168 46 492 214
Net income 313 104 915 540
Other comprehensive income (loss):        
Change in unrealized value of available-for-sale securities, net of income tax (67) 41 (276) (310)
Reclassification of gains included in net income, net of income tax (160) (80) (625) (329)
Net change in other comprehensive loss (227) (39) (901) (639)
Net comprehensive income (loss) $ 86 $ 65 $ 14 $ (99)
Basic        
Net income per share $ 0.09 $ 0.03 $ 0.27 $ 0.15
Weighted average shares 3,395,521 3,394,696 3,395,515 3,394,033
Diluted        
Net income per share $ 0.09 $ 0.02 $ 0.25 $ 0.15
Weighted average shares 3,658,751 3,511,784 3,652,761 3,448,064
Dividends paid per common share $ 0.00 $ 0.00 $ 0.00 $ 0.08