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Statements of Income - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Net sales $ 10,545,468 $ 12,181,971
Costs and expenses:    
Cost of sales 5,404,328 5,721,584
Operating expenses 2,434,148 2,356,819
Research and development expense 463,644 456,779
Total costs and expenses 8,302,120 8,535,182
Income from operations 2,243,348 3,646,789
Investment income 365,308 434,679
Net gain on marketable securities 34,359 26,989
Total other income 399,667 461,668
Income before provision for income taxes 2,643,015 4,108,457
Provision for income taxes 537,277 857,582
Net income $ 2,105,738 $ 3,250,875
Earnings per common share (basic and diluted) (in dollars per share) $ 0.46 $ 0.71
Weighted average shares (basic and diluted) (in shares) 4,594,319 4,594,319