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Note 4 - Supplementary Cash Flow Information - Supplementary Cash Flow Elements (Details) - USD ($) | 9 Months Ended
--- | ---
Jan. 31, 2018 | Jan. 31, 2017
State and local income tax payments | $ 232,000 | $ 552,000
Federal income tax payments to the Parent | $ 3,450,000 | $ 5,250,000

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