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Consolidated Statements Of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]    
Net Sales $ 1,716 $ 1,885
Cost of Goods Sold 782 823
Gross Profit 934 1,062
Operating Expenses    
Selling and marketing 427 407
General and administrative 482 406
Research and development 173 216
Total Operating Expenses 1,082 1,029
Operating Income (Loss) (148) 33
Non-operating Income (Expense)    
Interest expense (1) (4)
Gain on sale of available-for-sale securities 0 815
Interest income 11 1
Other income 3 3
Total Non-operating Income, Net 13 815
Income (Loss) before Income Taxes (135) 848
Provision for (benefit from) income taxes (46) 295
Net Income (Loss) (89) 553
Other Comprehensive Loss    
Change in unrealized value of available-for-sale securities, net of income tax 0 69
Reclassification of gains included in net income, net of income tax 0 (505)
Other Comprehensive Loss 0 (436)
Net Comprehensive Income (Loss) $ (89) $ 117
Basic    
Net income (loss) per share $ (0.03) $ 0.16
Weighted average shares 3,395,521 3,395,521
Diluted    
Net income (loss) per share $ (0.03) $ 0.15
Weighted average shares 3,395,521 3,653,021