Note 8 - Income Taxes - Reconciliation of the Federal Statutory Income Tax Rate to the Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Statutory federal income tax rate expense, net of noncontrolling interest	21.00%	21.00%
State income tax, net of federal benefits	5.38%	5.59%
Permanent tax	(1.12%)	5.36%
Other	(1.25%)	(15.00%)
Effective Income Tax Rate Reconciliation, Percent, Total	24.01%	16.95%
PROVISION (BENEFIT) FOR INCOME TAXES
Deferred income tax (benefit)	$ 174	$ (225)
Current Income Tax Expense (Benefit), Total	3,102	536
Total income tax expense	$ 3,276	$ 311