Note 7 - Schedule of non voting revenues interest and non voting profits interests (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Value Line’s non-voting revenues interest	$ 1,787	$ 1,902
Non-voting profits interest in EAM	129	140
	$ 1,916	$ 2,042