Note 9 - Leases - Operating Lease (Details)	3 Months Ended	9 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Operating lease cost	$ 38,641	$ 115,923
Variable lease cost	30,227	90,681
Total	68,868	206,604
Operating cash flows for leases	$ 43,365	$ 130,095
Remaining lease term (Year)	1 year
Discount rate	3.50%	3.50%