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Statements of Income (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Net sales $ 2,481,127 $ 3,254,944
Costs and expenses    
Cost of sales 1,123,076 1,556,490
Operating expenses 632,735 568,865
Research and development 114,394 102,982
Total costs and expenses 1,870,205 2,228,337
Income from operations 610,922 1,026,607
Other income:    
Investment income 84,687 98,073
Net gain on marketable securities 12,350 41,496
Total other income 97,037 139,569
Income before provision for income taxes 707,959 1,166,176
Provision for income taxes 147,064 240,734
Net income $ 560,895 $ 925,442
Earnings per common share (basic and diluted)    
Earnings per common share (basic and diluted) (in dollars per share) $ 0.12 $ 0.2
Weighted average shares – basic and diluted (in shares) 4,594,319 4,594,319