Note 3 - Related Party Transactions (Details Textual) - USD ($)	12 Months Ended
Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Ownership Percentage By Parent	91.74%
AB&Co [Member]
Accounts Receivable, after Allowance for Credit Loss	$ 0	$ 0
Income Taxes Paid	5,058,000	5,448,000	$ 4,425,000
AB&Co [Member] \| Reimbursement for Payments and Services [Member]
Related Party Transaction, Amounts of Transaction	356,000	364,000
EAM Trust [Member]
Assets under Management, Carrying Amount	4,680,000,000	4,170,000,000
Increase (Decrease) in Assets under Management	$ 510,000,000
Percentage of Assets Increased (Decreased) in Unconsolidated Entities	12.00%
Non Voting Profits Interest Percent	50.00%
Non Voting Profits Interest in Variable Entity Not yet Paid	$ 4,493,000	$ 3,865,000
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%

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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- Definition

The carrying amount of assets an investment adviser manages on behalf of investors.

+ References

No definition available.

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- Definition

Amount, before refund, of cash paid to foreign, federal, state, and local jurisdictions as income tax.

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- Definition

Amount of transactions with related party during the financial reporting period.

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- Definition

This element represents the amount of increase decrease in the value of assets managed by EAM.

+ References

No definition available.

+ Details

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- Definition

Represents distributable amounts earned through the balance sheet date, which is included in the Investment in variable interest entity and not yet paid.

+ References

No definition available.

+ Details

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Represents percentage of non-voting profits interest.

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Represents percentage of non-voting revenues interest.

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

Represents the stated percentage of assets increased (decreased) in unconsolidated entities.

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- Definition

Represents the stated percentage of non voting profits interests due from ex-subsidiary payable to parent under agreement.

+ References

No definition available.

+ Details

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