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Statements Of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statements Of Comprehensive Income (Loss) [Abstract]    
Net sales $ 7,621 $ 8,258
Cost of goods sold 3,691 3,892
Gross profit 3,930 4,366
Operating expenses    
Selling and marketing 1,612 1,929
General and administrative 1,686 1,657
Research and development 836 811
Total operating expenses 4,134 4,397
Operating loss (204) (31)
Non-operating income (expense)    
Interest expense (3) (2)
Interest income 36 209
Other income (expense) (1) 10
Total non-operating income, net 32 217
Income (loss) before income taxes (172) 186
Income tax benefit (48) (1)
Net income (loss) (124) 187
Other comprehensive income (loss)    
Change in unrealized value of available-for-sale securities, net of income tax 1 (32)
Other comprehensive income (loss) 1 (32)
Net Comprehensive Income (Loss) $ (123) $ 155
Basic    
Net income (loss) per share $ (0.04) $ 0.06
Weighted average shares 3,395,521 3,395,521
Diluted    
Net income (loss) per share $ (0.04) $ 0.06
Weighted average shares 3,395,521 3,398,035