Note 13 - Lease Right-to-use - Lease Cost (Details) - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2023	Jan. 31, 2022
Amortization of right-of-use assets	$ 141	$ 138
Interest on lease liabilities	141	112
Total finance lease cost	$ 282	$ 250
Weighted average remaining lease term - Financing leases (in years) (Year)	46 years	44 years
Weighted average discount rate - Financing leases	5.80%	5.00%