Note 9 - Leases - Operating Lease (Details)	3 Months Ended	6 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Operating lease cost	$ 38,641	$ 77,282
Variable lease cost	30,227	60,454
Total	68,868	137,736
Operating cash flows for leases	$ 43,365	$ 86,730
Remaining lease term (Year)	1 year 91 days
Discount rate	3.50%	3.50%