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Note 4 - Investments - Assets and Liabilities (Details) - USD ($)
$ in Thousands
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
EAM's total assets $ 131,076 $ 128,743    
EAM's total liabilities 47,403 49,098    
EAM's total equity 83,673 79,645 $ 67,013 $ 53,539
EAM Trust [Member]        
EAM's total assets 61,389 63,592    
EAM's total liabilities [1] 4,357 6,282    
EAM's total equity $ 57,032 $ 57,310    
[1] At April 30, 2023 and 2022, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues and non-voting profits interests of $2,601,000 and $3,657,000, respectively.