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Note 3 - Related Party Transactions (Details Textual) - USD ($)	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Ownership Percentage By Parent	91.51%
AB&Co [Member]
Accounts Receivable, after Allowance for Credit Loss	$ 0	$ 0
Income Taxes Paid	4,425,000	5,400,000	$ 7,154,000
AB&Co [Member] | Reimbursement for Payments and Services [Member]
Related Party Transaction, Amounts of Transaction	369,000	385,000
EAM Trust [Member]
Assets under Management, Carrying Amount	3,090,000,000.00	3,360,000,000
Increase (Decrease) in Assets under Management	$ 270,000,000
Percentage of Assets Increased (Decreased) in Unconsolidated Entities	8.00%
Non Voting Profits Interest Percent	50.00%
Non Voting Profits Interest in Variable Entity Not yet Paid	$ 2,601,000	$ 3,657,000
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%

X

- 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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