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Note 7 - Related Party Transactions (Details Textual) - USD ($) | 9 Months Ended |
--- | --- | ---
Jan. 31, 2024 | Jan. 31, 2023 | Apr. 30, 2023
Ownership Percentage By Parent | 91.59% |  |
AB&Co [Member] |  |  |
Accounts Receivable, after Allowance for Credit Loss | $ 0 |  | $ 0
Income Taxes Paid | 4,000,000 | $ 3,327,000 |
AB&Co [Member] | Reimbursement for Payments and Services [Member] |  |  |
Related Party Transaction, Amounts of Transaction | 230,000 | 232,000 |
EAM Trust [Member] |  |  |
Assets under Management, Carrying Amount | $ 4,060,000,000.00 | $ 3,040,000,000.00 |
Percentage of Assets Increased (Decreased) in Unconsolidated Entities | 33.60% |  |
Non Voting Profits Interest Percent | 50.00% |  |
Voting Profits Interest Percent | 50.00% |  |
Accrued Investment Income Receivable | $ 3,448,000 |  |
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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