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Note 7 - Federal, State and Local Income Taxes (Details Textual) - USD ($)
12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, Percent 24.00% 22.25% 23.11%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 3.25% 3.12% 2.05%
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 $ 50,805,000