Note 9 - Leases - Operating Lease (Details)	3 Months Ended	9 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Operating lease cost	$ 38,641	$ 115,923
Variable lease cost	30,608	91,824
Total	69,249	207,747
Operating cash flows for leases	$ 44,433	$ 133,299
Remaining lease term (Month)	5 years 90 days	5 years 90 days
Discount rate	3.50%	3.50%