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Note 2 - Investments - Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jul. 31, 2020
Apr. 30, 2020
Jul. 31, 2019
Apr. 30, 2019
EAM's total assets $ 110,891 $ 109,728    
EAM's total liabilities (1) 54,135 56,189    
EAM's total equity 56,756 53,539 $ 49,276 $ 47,524
EAM Trust [Member]        
EAM's total assets 62,563 61,335    
EAM's total liabilities (1) [1] 5,672 4,192    
EAM's total equity $ 56,891 $ 57,143    
[1] At July 31, 2020 and April 30, 2020, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues interest and non-voting profits interest of $3,607,000 and $2,949,000, respectively.