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Note 2 - Supplementary Cash Flow Information - Supplementary Cash Flow Elements (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
State and local income tax payments | $ 560,000 | $ 188,000 | $ 238,000
Federal income tax payments to the Parent | $ 6,824,000 | $ 3,545,000 | $ 3,366,000

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