Note 7 - Operating Leases (Details Textual) - USD ($)	9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating Lease, Weighted Average Remaining Lease Term (Year)	13 years
Operating Lease, Weighted Average Discount Rate, Percent	7.40%
Operating Lease, Expense	$ 445,000	$ 445,000