Note 3 - Income Taxes - Reconciliation of the Federal Statutory Income Tax Rate to the Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Statutory federal income tax rate expense, net of noncontrolling interest	30.00%	34.00%
State income tax, net of federal benefits	8.16%	1.93%
Permanent tax	11.33%	1.70%
Other	11.82%	(4.30%)
	61.31%	33.33%
PROVISION (BENEFIT) FOR INCOME TAXES
Deferred income tax	$ 732	$ 179
Provision (benefit) for income taxes	(192)	589
Total income tax expense	$ 540	$ 768