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Note 3 - Related Party Transactions - Non-voting Revenues Interest and Non-voting Profits Interests (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Non-voting revenues interest in EAM | $ 11,184 | $ 8,260 | $ 8,040
Non-voting profits interest in EAM | 1,166 | 1,049 | 746
Revenues and Profits Distribution from Unconsolidated Entity | $ 12,350 | $ 9,309 | $ 8,786

X
- Definition Represents the income received against non voting profits in unconsolidated entity. + References No definition available. + Details
Name: | valu_NonVotingProfitsInterestInUnconsolidatedEntity
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the income received against non voting revenues in unconsolidated entity. + References No definition available. + Details
Name: | valu_NonVotingRevenuesInterestInUnconsolidatedEntity
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the revenues and profits distribution from unconsolidated entity. + References No definition available. + Details
Name: | valu_RevenuesAndProfitsDistributionFromUnconsolidatedEntity
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration