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Note 3 - Variable Interest Entity (Details Textual)	6 Months Ended
	Oct. 31, 2019
EAM Trust [Member]
Non Voting Profits Interest Percent	50.00%

X

- Definition

Represents percentage of non-voting profits interest.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=valu_EulavAssetManagementLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: