Note 4 - Income Taxes - Reconciliation of the Federal Statutory Income Tax Rate to the Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Statutory federal income tax rate expense, net of noncontrolling interest	21.00%	30.00%
State income tax, net of federal benefits	1.90%	8.16%
Permanent tax	1.93%	11.33%
Other	1.46%	11.82%
	26.29%	61.31%
PROVISION (BENEFIT) FOR INCOME TAXES
Deferred income tax	$ 1,078	$ 732
Current Income Tax Expense (Benefit), Total	297	(192)
Total income tax expense	$ 1,375	$ 540