Note 14 - Lease Right-to-use - Lease Cost (Details) - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2024	Jan. 31, 2023
Amortization of right-of-use assets	$ 142	$ 141
Interest on lease liabilities	140	141
Total finance lease cost	$ 282	$ 282
Weighted average remaining lease term - Financing leases (in years) (Year)	44 years	46 years
Weighted average discount rate - Financing leases	5.80%	5.80%