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Note 8 - Employees' Profit Sharing and Savings Plan (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Deferred Compensation Arrangement with Individual, Contributions by Employer | $ 345,000 | $ 473,000 | $ 422,000
Deferred Compensation Arrangement with Individual, Plan Reimbursement for Fees | $ 277,000 |  |

X
- Definition Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The reimbursement to a plan of fees received indirectly by the plan sponsor. + References No definition available. + Details
Name: | valu_DeferredCompensationArrangementWithIndividualPlanReimbursementForFees
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration