Statements of Income - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue	$ 25,412,163	$ 26,472,337
Cost of sales	4,889,295	5,216,112
Gross profit	20,522,868	21,256,225
Research and development	3,690,539	4,107,692
Selling, general, and administrative	1,317,543	1,223,971
Total expenses	5,008,082	5,331,663
Income from operations	15,514,786	15,924,562
Interest income	1,787,117	1,785,277
Income before taxes	17,301,903	17,709,839
Provision for income taxes	2,775,261	3,201,903
Net income	$ 14,526,642	$ 14,507,936
Net income per share – basic (in dollars per share)	$ 3	$ 3
Net income per share – diluted (in dollars per share)	3	2.99
Cash dividends declared per common share (in dollars per share)	$ 4	$ 4
Weighted average common shares outstanding – basic (in shares)	4,845,627	4,844,010
Diluted (in shares)	4,847,294	4,850,567
Product [Member]
Revenue	$ 24,400,192	$ 25,291,306
Contract Research and Development [Member]
Revenue	$ 1,011,971	$ 1,181,031