Note 7 - Leases - Operating Lease (Details) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating lease cost	$ 158,439	$ 154,565
Variable lease cost	109,449	96,798
Total	267,888	251,363
Operating cash flows for leases	$ 133,299	$ 174,528
Remaining lease term (Month)	150 days	180 days
Discount rate	3.50%	3.50%