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Consolidated Statements Of Comprehensive Income (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statements Of Operations And Comprehensive Income [Abstract]    
Net sales $ 6,541 $ 6,498
Cost of goods sold 2,798 2,858
Gross profit 3,743 3,640
Operating expenses:    
Selling and marketing 1,442 1,344
General and administrative 1,352 1,022
Research and development 560 443
Total operating expenses 3,354 2,809
Operating income 389 831
Non-operating income:    
Gain on sale of available-for-sale securities 530 794
Interest income 5 4
Other income 14 13
Total non-operating income 549 811
Income before income taxes 938 1,642
Income taxes 232 556
Net income 706 1,086
Other comprehensive income:    
Change in unrealized value of available-for-sale securities, net of income tax (262) 805
Reclassification of gains included in net income, net of income tax (329) (492)
Net increase (decrease) in accumulated other comprehensive income (591) 313
Total comprehensive income $ 115 $ 1,399
Basic    
Net income per share $ 0.20 $ 0.32
Weighted average shares 3,394,208 3,391,332
Diluted    
Net income per share $ 0.20 $ 0.31
Weighted average shares 3,496,873 3,412,288
Dividends paid per common share $ 0.08 $ 0.16