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Note 7 - Related Party Transactions - Non Voting Revenues Interest and Non Voting Profits Interests (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2018 | Jul. 31, 2017
Value Line’s non-voting revenues interest | $ 1,968 | $ 1,978
Non-voting profits interest in EAM | 303 | 158
| $ 2,271 | $ 2,136

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