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Note 3 - Variable Interest Entity - Total Assets, the Maximum Exposure to Loss, and Value of the Assets and Liabilities in EAM (Details) - USD ($)
$ in Thousands
Oct. 31, 2019
Apr. 30, 2019
Assets $ 101,605 $ 91,788
Variable Interest Entity, Not Primary Beneficiary [Member] | EAM Trust [Member]    
Investment in EAM Trust [1] 59,186 58,625
Value Line Liabilities
Value Line Maximum Exposure to Loss 59,186 58,625
EAM Trust [Member]    
Assets $ 61,701 $ 60,683
[1] Reported within Long-Term Assets on the Consolidated Condensed Balance Sheets.