Note 3 - Income Taxes - Reconciliation of the Federal Statutory Income Tax Rate to the Effective Tax Rate (Details) - USD ($)	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Statutory federal income tax rate (benefit) expense, net of noncontrolling interest	34.00%	34.00%
State income tax net of federal benefits	1.93%	0.00%
Permanent tax	1.70%	30.70%
Other	(4.30%)	14.75%
	33.33%	79.45%
PROVISION FOR INCOME TAXES
Deferred income tax	$ 179,000	$ 93,000
Provision for income taxes	589,000	0
Total income tax expense	$ 768,000	$ 93,000