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Note 7 - Related Party Transactions (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2025 | Jul. 31, 2024 | Apr. 30, 2025
Ownership Percentage By Parent | 91.76% |  |
AB&Co [Member] |  |  |
Accounts Receivable, after Allowance for Credit Loss | $ 0 |  | $ 0
Income Taxes Paid | 0 | $ 0 |
AB&Co [Member] | Reimbursement for Payments and Services [Member] |  |  |
Related Party Transaction, Amounts of Transaction | 58,000 | $ 60,000 |
EAM Trust [Member] |  |  |
Assets under Management, Carrying Amount | $ 5,010,000,000.00 |  | $ 4,600,000,000
Percentage of Assets Increased (Decreased) in Unconsolidated Entities | 8.80% |  |
Non Voting Profits Interest Percent | 50.00% |  |
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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