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Note 4 - Investments - Assets and Liabilities (Details) - USD ($)
$ in Thousands
Apr. 30, 2021
Dec. 31, 2020
Apr. 30, 2020
Dec. 31, 2019
Apr. 30, 2019
Apr. 30, 2018
EAM's total assets $ 121,136   $ 109,728      
EAM's total liabilities (1) 54,123   56,189      
EAM's total equity 67,013 $ 53,539 53,539 $ 47,524 $ 47,524 $ 43,541
EAM Trust [Member]            
EAM's total assets 64,197   61,335      
EAM's total liabilities (1) [1] 6,870   4,192      
EAM's total equity $ 57,327   $ 57,143      
[1] At April 30, 2021 and 2020, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues and non-voting profits interests of $4,664,000 and $2,949,000, respectively.