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Note 3 - Variable Interest Entity - Schedule of Total Assets, the Maximum Exposure to Loss, Value of the Assets and Liabilities in EAM (Details) - USD ($)
Jan. 31, 2017
Apr. 30, 2016
Equity Method Investments $ 58,197,000 $ 57,942,000
EAM Trust [Member]    
VIE Assets 60,354,000 60,292,000
Equity Method Investments 58,197,000 [1] 57,942,000
Value Line Liabilities
Value Line Liabilities $ 58,197,000 $ 57,942,000
[1] Reported within Long Term Assets on the Consolidated Condensed Balance Sheets.