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%

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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