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Note 4 - Supplementary Cash Flow Information - Supplementary Cash Flow Elements (Details) - USD ($) | 6 Months Ended
--- | ---
Oct. 31, 2017 | Oct. 31, 2016
State and local income tax payments | $ 166,000 | $ 422,000
Federal income tax payments to the Parent | $ 2,200,000 | $ 3,218,000

X
- Definition Amount represents Federal income tax payments to the Parent. + References No definition available. + Details
Name: | valu_FederalIncomeTaxPaymentsToParent
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount represents State and local income tax payments. + References No definition available. + Details
Name: | valu_StateAndLocalIncomeTaxPayments
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration