Note 7 - Operating Leases (Details Textual) - USD ($)	6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating Lease, Weighted Average Remaining Lease Term (Year)	13 years 255 days
Operating Lease, Weighted Average Discount Rate, Percent	7.50%
Operating Lease, Expense	$ 296,000	$ 296,000