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Note 5 - Schedule of Total Assets, the Maximum Exposure to Loss, Value of the Assets and Liabilities in EAM (Details) - USD ($)
Apr. 30, 2016
Apr. 30, 2015
EAM Trust [Member]    
VIE Assets $ 60,292,000 $ 60,159,000
Equity Method Investments [1] 57,942,000 58,048,000
Value Line Liabilities
Value Line Maximum Exposure to Loss 57,942,000 58,048,000
Equity Method Investments $ 57,942,000 $ 58,048,000
[1] Reported within Long Term Assets on Consolidated Balance Sheets.