Note 9 - Leases - Operating Lease (Details)	3 Months Ended	6 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)
Operating lease cost	$ 38,641	$ 77,282
Variable lease cost	30,608	61,216
Total	69,249	138,498
Operating cash flows for leases	$ 44,433	$ 88,866
Remaining lease term (Month)	5 years 180 days	5 years 180 days
Discount rate	3.50%	3.50%