STATEMENTS OF INCOME (Unaudited) - USD ($)	3 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Revenue
Product sales	$ 8,700,092	$ 7,072,961
Contract research and development	131,322	263,446
Total revenue	8,831,414	7,336,407
Cost of sales	2,079,623	1,651,847
Gross profit	6,751,791	5,684,560
Expenses
Research and development	695,992	601,918
Selling, general, and administrative	475,115	371,320
Credit loss expense	212,440	0
Total expenses	1,383,547	973,238
Income from operations	5,368,244	4,711,322
Interest income	436,526	283,059
Income before taxes	5,804,770	4,994,381
Provision for income taxes	1,401,040	854,265
Net income	$ 4,403,730	$ 4,140,116
Net income per share - basic	$ 0.91	$ 0.86
Net income per share - diluted	0.91	0.86
Cash dividends declared per common share	$ 1.00	$ 1.00
Weighted average shares outstanding
Weighted Average Number of Shares Outstanding, Basic	4,832,166	4,830,826
Weighted Average Number of Shares Outstanding, Diluted	4,840,571	4,830,871