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STATEMENTS OF INCOME (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenue        
Product sales $ 6,138,772 $ 6,104,433 $ 12,047,342 $ 12,720,292
Contract research and development 208,220 654,257 404,294 821,642
Revenues 6,346,992 6,758,690 12,451,636 13,541,934
Cost of sales 1,378,494 947,254 2,561,017 1,922,748
Gross profit 4,968,498 5,811,436 9,890,619 11,619,186
Expenses        
Research and development 873,470 847,603 1,593,701 1,726,131
Selling, general, and administrative 436,919 568,241 855,559 1,108,645
Total expenses 1,310,389 1,415,844 2,449,260 2,834,776
Income from operations 3,658,109 4,395,592 7,441,359 8,784,410
Interest income 484,330 464,429 982,538 958,388
Other income 3,094 0 3,905 0
Income before taxes 4,145,533 4,860,021 8,427,802 9,742,798
Provision for income taxes 834,695 833,876 1,541,146 1,619,066
Net income $ 3,310,838 $ 4,026,145 $ 6,886,656 $ 8,123,732
Net income per share - basic $ 0.68 $ 0.83 $ 1.42 $ 1.68
Net income per share - diluted 0.68 0.83 1.42 1.68
Cash dividends declared per common share $ 1 $ 1 $ 2 $ 2
Weighted average shares outstanding        
Weighted Average Number of Shares Outstanding, Basic 4,837,166 4,833,855 4,837,166 4,833,766
Weighted Average Number of Shares Outstanding, Diluted 4,839,243 4,839,291 4,839,049 4,839,145