Note 3 - Related Party Transactions - Non Voting Revenues Interest and Non Voting Profits Interests (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Non-voting revenues interest in EAM	$ 8,040	$ 7,195	$ 7,211
Non-voting profits interest in EAM	746	519	440
	$ 8,786	$ 7,714	$ 7,651

Represents the income received against non voting revenues in unconsolidated entity.

No definition available.

Name:	valu_NonVotingRevenuesInterestInUnconsolidatedEntity
Namespace Prefix:	valu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration