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CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statements of Comprehensive Income (Loss) [Abstract]        
Net sales $ 2,512 $ 2,057 $ 6,973 $ 6,239
Cost of goods sold 1,247 1,064 3,581 3,156
Gross profit 1,265 993 3,392 3,083
Operating expenses        
Selling and marketing 340 307 1,044 1,021
General and administrative 517 494 1,621 1,458
Research and development 235 218 761 724
Total operating expenses 1,092 1,019 3,426 3,203
Operating income (loss) 173 (26) (34) (120)
Non-operating income        
Interest expense 0 0 0 (1)
Interest income 117 109 342 297
Total non-operating income, net 117 109 342 296
Income before income tax expense 290 83 308 176
Income tax expense 52 75 63 96
Net income 238 8 245 80
Other comprehensive loss        
Change in unrealized value of available-for-sale securities, net of income tax 0 (1) 0 (3)
Other comprehensive loss 0 (1) 0 (3)
Net comprehensive income $ 238 $ 7 $ 245 $ 77
Basic        
Net income per share $ 0.07 $ 0 $ 0.07 $ 0.02
Weighted average shares 3,428,021 3,428,021 3,428,021 3,428,021
Diluted        
Net income per share $ 0.07 $ 0 $ 0.07 $ 0.02
Weighted average shares 3,434,417 3,428,021 3,440,382 3,428,021