Note 6 - Income Taxes - Schedule of Income Tax Provisions (Details) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Current taxes
Federal, Current taxes	$ 2,600,670	$ 2,710,658
State, Current taxes	75,852	(13,176)
Deferred taxes
Federal, Deferred taxes	(123,959)	74,651
State, Deferred taxes	(5,195)	3,128
Income tax provision	$ 2,547,368	$ 2,775,261