Statements of Income - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue
Revenue	$ 21,366,246	$ 25,412,163
Cost of sales	4,121,461	4,889,295
Gross profit	17,244,785	20,522,868
Expenses
Research and development	3,184,754	3,690,539
Selling, general, and administrative	1,316,427	1,317,543
Total expenses	4,501,181	5,008,082
Income from operations	12,743,604	15,514,786
Interest income	1,498,148	1,787,117
Income before taxes	14,241,752	17,301,903
Provision for income taxes	2,547,368	2,775,261
Net income	$ 11,694,384	$ 14,526,642
Net income per share – basic (in dollars per share)	$ 2.42	$ 3
Net income per share – diluted (in dollars per share)	2.42	3
Cash dividends declared per common share (in dollars per share)	$ 4	$ 4
Weighted average shares outstanding
Basic (in shares)	4,834,054	4,845,627
Diluted (in shares)	4,834,462	4,847,294
Product [Member]
Revenue
Revenue	$ 20,540,557	$ 24,400,192
Contract Research and Development [Member]
Revenue
Revenue	$ 825,689	$ 1,011,971