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Note 7 - Related Party Transactions (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
	Oct. 31, 2024	Oct. 31, 2024	Oct. 31, 2023	Apr. 30, 2024
Ownership Percentage By Parent	91.67%	91.67%
AB&Co [Member]
Increase (Decrease) in Accounts Receivable, Related Parties	$ 0	$ 0		$ 0
AB&Co [Member] | Reimbursement for Payments and Services [Member]
Related Party Transaction, Amounts of Transaction		168,000	$ 170,000
EAM Trust [Member]
Assets under Management, Carrying Amount	$ 4,780,000,000	$ 4,780,000,000	$ 3,310,000,000
Percentage of Assets Increased (Decreased) in Unconsolidated Entities	44.60%
Non Voting Revenues Interest Percent		50.00%
Non Voting Profits Interest Percent		50.00%
Accrued Investment Income Receivable	$ 4,572,000	$ 4,572,000
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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- Definition

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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