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Note 7 - Federal, State and Local Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		30.33%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Percent, Total		(23.87%)	33.05%	27.15%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent		(54.51%)
Earliest Tax Year [Member]
Open Tax Year		2014
Latest Tax Year [Member]
Open Tax Year		2017
Former Employee [Member]
Deferred Tax Assets, Deferred Non Cash Postemployment Compensation, Noncurrent		$ 1,770,000
Asset Management and Mutual Fund Distribution Subsidiaries [Member]
Deconsolidation, Gain (Loss), Amount		$ 50,510,000
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%