Note 13 - Lease Right-to-use - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Amortization of right-of-use assets	$ 46	$ 52
Interest on lease liabilities	45	38
Total finance lease cost	$ 91	$ 90
Weighted average remaining lease term - Financing leases (Year)	46 years	44 years
Weighted average discount rate - Financing leases	5.80%	5.00%