Statements of Income - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue
Revenue	$ 26,986,970	$ 21,366,246
Cost of sales	6,263,090	4,121,461
Gross profit	20,723,880	17,244,785
Expenses
Research and development	2,925,874	3,184,754
Selling, general, and administrative	1,469,321	1,316,427
Total expenses	4,395,195	4,501,181
Income from operations	16,328,685	12,743,604
Interest income	1,171,128	1,498,148
Income before taxes	17,499,813	14,241,752
Provision for income taxes	2,992,312	2,547,368
Net income	$ 14,507,501	$ 11,694,384
Net income per share – basic (in dollars per share)	$ 3.00	$ 2.42
Net income per share – diluted (in dollars per share)	3.00	2.42
Cash dividends declared per common share (in dollars per share)	$ 4.00	$ 4.00
Weighted average shares outstanding
Basic (in shares)	4,833,661	4,834,054
Diluted (in shares)	4,835,639	4,834,462
Product [Member]
Revenue
Revenue	$ 25,867,649	$ 20,540,557
Contract Research and Development [Member]
Revenue
Revenue	$ 1,119,321	$ 825,689