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Note 7 - Related Party Transactions (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2023 | Jul. 31, 2022 | Apr. 30, 2022
Ownership Percentage By Parent | 91.55% |  |
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 | 63,000 | 62,000 |
EAM Trust [Member] |  |  |
Assets under Management, Carrying Amount | $ 3,470,000,000 | $ 3,160,000,000 |
Percentage of Assets Increased (Decreased) in Unconsolidated Entities | 9.80% |  |
Non Voting Profits Interest Percent | 50.00% |  |
Voting Profits Interest Percent | 50.00% |  |
Accrued Investment Income Receivable | $ 2,833,000 |  |
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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