Note 7 - Leases (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 02, 2020
Lessee, Operating Lease, Renewal Term (Month)			5 years 90 days
Monthly Base Rent		$ 14,811
Monthly Base Rent, Annual Increase in Two Years, Percent		2.00%
Monthly Base Rent, Annual Increase in Three Years, Percent		2.00%
Monthly Base Rent, Annual Increase in Four Years, Percent		2.00%
Monthly Base Rent, Annual Increase in Five Years, Percent		2.00%
Forecast [Member]
Monthly Base Rent	$ 14,241