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Condensed Statements Of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Statements Of Comprehensive Income (Loss) [Abstract]        
Net sales $ 2,092 $ 2,260 $ 4,015 $ 4,268
Cost of goods sold 994 1,025 1,918 1,966
Gross profit 1,098 1,235 2,097 2,302
Operating expenses        
Selling and marketing 443 516 901 1,001
General and administrative 440 418 905 890
Research and development 196 213 413 409
Total operating expenses 1,079 1,147 2,219 2,300
Operating income (loss) 19 88 (122) 2
Non-operating income (expense)        
Loss on investment 0 0 (3) 0
Interest expense (1) (1) (1) (1)
Interest income 1 41 33 85
Other income 0 3 2 5
Total non-operating income, net 0 43 31 89
Income (loss) before income tax expense (benefit) 19 131 (91) 91
Provision for (benefit of) income tax 1 28 (18) 19
Net income (loss) 18 103 (73) 72
Other comprehensive income        
Change in unrealized value of available-for-sale securities, net of income tax 0 7 0 8
Other comprehensive income 0 7 0 8
Net comprehensive income (loss) $ 18 $ 110 $ (73) $ 80
Basic        
Net income (loss) per share $ 0.01 $ 0.03 $ (0.02) $ 0.02
Weighted average shares 3,395,521 3,395,521 3,395,521 3,395,521
Diluted        
Net income (loss) per share $ 0.01 $ 0.03 $ (0.02) $ 0.02
Weighted average shares 3,395,521 3,395,521 3,395,521 3,395,521