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Condensed Statements Of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Statements of Comprehensive Income (Loss) [Abstract]        
Net sales $ 2,216 $ 2,154 $ 6,915 $ 6,517
Cost of goods sold 1,053 950 3,178 2,947
Gross profit 1,163 1,204 3,737 3,570
Operating expenses        
Selling and marketing 357 375 1,230 1,087
General and administrative 497 620 2,125 1,521
Research and development 190 189 642 675
Total operating expenses 1,044 1,184 3,997 3,283
Operating income (loss) 119 20 (260) 287
Non-operating income        
Interest expense (1) (1) (1) (1)
Interest income 36 2 44 4
Total non-operating income, net 35 1 43 3
Income (loss) before income tax expense (benefit) 154 21 (217) 290
Income tax expense (benefit) 32 4 (46) 61
Net income (loss) 122 17 (171) 229
Other comprehensive loss        
Change in unrealized value of available-for-sale securities, net of income tax (2) 0 0 (1)
Other comprehensive loss (2) 0 0 (1)
Net comprehensive income (loss) $ 120 $ 17 $ (171) $ 228
Basic        
Net income (loss) per share $ 0.04 $ 0.01 $ (0.05) $ 0.07
Weighted average shares 3,401,880 3,395,521 3,397,664 3,395,521
Diluted        
Net income (loss) per share $ 0.04 $ 0 $ (0.05) $ 0.07
Weighted average shares 3,482,996 3,439,377 3,397,664 3,435,595