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Statements Of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statements Of Comprehensive Income (Loss) [Abstract]        
Net sales $ 2,146 $ 2,078 $ 5,642 $ 6,075
Cost of goods sold 951 944 2,559 2,718
Gross profit 1,195 1,134 3,083 3,357
Operating expenses        
Selling and marketing 406 342 1,242 1,127
General and administrative 414 402 1,370 1,225
Research and development 176 168 628 590
Total operating expenses 996 912 3,240 2,942
Operating income (loss) 199 222 (157) 415
Non-operating income        
Interest income 36 9 83 22
Other income 2 3 7 8
Total non-operating income 38 12 90 30
Income (loss) before income tax expense (benefit) 237 234 (67) 445
Provision for (benefit from) income taxes 50 82 (9) 154
Net income (loss) 187 152 (58) 291
Other comprehensive income        
Change in unrealized value of available-for-sale securities, net of income tax 0 6 6 10
Other comprehensive income 0 6 6 10
Net comprehensive income (loss) $ 187 $ 158 $ (52) $ 301
Basic        
Net income (loss) per share $ 0.06 $ 0.04 $ (0.02) $ 0.09
Weighted average shares 3,395,521 3,395,521 3,395,521 3,395,521
Diluted        
Net income (loss) per share $ 0.06 $ 0.04 $ (0.02) $ 0.09
Weighted average shares 3,398,238 3,400,988 3,395,521 3,396,899