Note 3 - Variable Interest Entity (Details Textual)	6 Months Ended
Oct. 31, 2018
EAM Trust [Member]
Non Voting Profits Interest Percent	50.00%

Represents percentage of non-voting profits interest.

No definition available.

Name:	valu_NonVotingProfitsInterestPercent
Namespace Prefix:	valu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration