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Note 2 - Investments - Assets and Liabilities (Details) - USD ($)
$ in Thousands
Oct. 31, 2021
Apr. 30, 2021
Oct. 31, 2020
Apr. 30, 2020
EAM's total assets $ 124,690 $ 121,136    
EAM's total liabilities 48,000 54,123    
EAM's total equity 76,690 67,013 $ 59,228 $ 53,539
EAM Trust [Member]        
EAM's total assets 65,372 64,197    
EAM's total liabilities [1] 8,260 6,870    
EAM's total equity $ 57,112 $ 57,327    
[1] At October 31, 2021 and April 30, 2021, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues interest and non-voting profits interest of $4,830,000 and $4,664,000, respectively.