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Note 2 - Investments - Assets and Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2024	Jul. 31, 2024	Apr. 30, 2024	Oct. 31, 2023	Jul. 31, 2023	Apr. 30, 2023
EAM's total assets	$ 139,992		$ 136,035
EAM's total liabilities	43,277		45,242
EAM's total equity	96,715	$ 93,854	90,793	$ 85,742	$ 85,491	$ 83,673
EAM Trust [Member]
EAM's total assets	63,953		63,076
EAM's total liabilities	6,861		5,881
EAM's total equity	$ 57,092		$ 57,195

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-Paragraph 2
-Subparagraph (SAB Topic 4.E)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480418/310-10-S99-2

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