Note 3 - Schedule of Total Assets, the Maximum Exposure to Loss, Value of the Assets and Liabilities in EAM (Details) - USD ($)		Jul. 31, 2016	Apr. 30, 2016
EAM Trust [Member]
VIE Assets		$ 60,955,000	$ 60,292,000
Equity Method Investments	[1]	58,123,000	57,942,000
Value Line Liabilities
Value Line Maximum Exposure to Loss		58,123,000	57,942,000
Equity Method Investments		$ 58,123,000	$ 57,942,000

[1] Reported within Long Term Assets on Consolidated Balance Sheets.