Note 13 - Lease Right-to-use - Lease Cost (Details) - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2022	Oct. 31, 2021
Amortization of right-of-use assets	$ 94	$ 95
Interest on lease liabilities	93	75
Total finance lease cost	$ 187	$ 170
Weighted average remaining lease term - Financing leases (in years) (Year)	46 years	45 years
Weighted average discount rate - Financing leases	5.80%	5.00%