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Note 2 - Investments - Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jan. 31, 2022
Oct. 31, 2021
Apr. 30, 2021
Jan. 31, 2021
Oct. 31, 2020
Apr. 30, 2020
EAM's total assets $ 129,752   $ 121,136      
EAM's total liabilities 50,351   54,123      
EAM's total equity 79,401 $ 76,690 67,013 $ 63,569 $ 59,228 $ 53,539
EAM Trust [Member]            
EAM's total assets 65,144   64,197      
EAM's total liabilities [1] 7,910   6,870      
EAM's total equity $ 57,234   $ 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.