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Note 7 - Related Party Transactions (Details Textual) - USD ($) | 3 Months Ended
--- | ---
Jul. 31, 2024 | Jul. 31, 2023
Ownership Percentage By Parent | 91.67% |
AB&Co [Member] |  |
Increase (Decrease) in Accounts Receivable, Related Parties | $ 0 | $ 0
Income Taxes Paid | 0 | 0
AB&Co [Member] | Reimbursement for Payments and Services [Member] |  |
Related Party Transaction, Amounts of Transaction | 60,000 | 63,000
EAM Trust [Member] |  |
Assets under Management, Carrying Amount | $ 4,600,000,000 | $ 3,470,000,000
Percentage of Assets Increased (Decreased) in Unconsolidated Entities | 32.60% |
Non Voting Revenues Interest Percent | 50.00% |
Non Voting Profits Interest Percent | 50.00% |
Voting Profits Interest Percent | 50.00% |
Accrued Investment Income Receivable | $ 4,215,000 |
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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