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Note 3 - Related Party Transactions (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Ownership Percentage By Parent | 91.51% |  |
AB&Co [Member] |  |  |
Accounts Receivable, after Allowance for Credit Loss | $ 0 | $ 0 |
Income Taxes Paid | 4,425,000 | 5,400,000 | $ 7,154,000
AB&Co [Member] | Reimbursement for Payments and Services [Member] |  |  |
Related Party Transaction, Amounts of Transaction | 369,000 | 385,000 |
EAM Trust [Member] |  |  |
Assets under Management, Carrying Amount | 3,090,000,000.00 | 3,360,000,000 |
Increase (Decrease) in Assets under Management | $ 270,000,000 |  |
Percentage of Assets Increased (Decreased) in Unconsolidated Entities | 8.00% |  |
Non Voting Profits Interest Percent | 50.00% |  |
Non Voting Profits Interest in Variable Entity Not yet Paid | $ 2,601,000 | $ 3,657,000 |
EAM Trust [Member] | Minimum [Member] |  |  |
Non Voting Revenues Interest Percent | 41.00% |  |
Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement | 90.00% |  |
EAM Trust [Member] | Maximum [Member] |  |  |
Non Voting Revenues Interest Percent | 55.00% |  |

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