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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 ($)
Jul. 31, 2019
Apr. 30, 2019
Equity Method Investments $ 58,971,000 $ 58,625,000
EAM Trust [Member]    
VIE Assets 61,366,000 60,683,000
Equity Method Investments [1] 58,971,000 58,625,000
Value Line Liabilities
Value Line Liabilities $ 58,971,000 $ 58,625,000
[1] Reported within Long-Term Assets on the Consolidated Condensed Balance Sheets.