Note 9 - Leases (Details Textual) - USD ($)	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2016
Operating Lease, Payments	$ 25,468
Finance Lease, Right-of-Use Asset			$ 129,000
Finance Lease, Right-of-Use Asset, Accumulated Amortization	94,000
Selling, General and Administrative Expenses [Member]
Operating Lease, Expense	$ 18,000	$ 18,000