Note 9 - Leases - Operating Lease (Details)	3 Months Ended	6 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)
Operating lease cost	$ 42,515	$ 85,030
Variable lease cost	31,029	62,058
Total	73,544	147,088
Operating cash flows for leases	$ 37,962	$ 75,924
Remaining lease term (Month)	54 months	54 months
Discount rate	3.50%	3.50%