Document And Entity Information Equity Method Investments [Policy Text Block] Statistical Measurement [Axis] Note To Financial Statement Details Textual Investment gains/(losses) Total investment gains/(losses) Income tax provision Income tax provision Investment Advice [Member] Significant Accounting Policies ecd_NonRule10b51ArrTrmntdFlag false Note 1 - Organization and Summary of Significant Accounting Policies ecd_NonRule10b51ArrAdoptedFlag false Note 2 - Supplementary Cash Flow Information Trading Arrangements, by Individual [Table] Note 3 - Related Party Transactions Restricted money market investments Material Terms of Trading Arrangement [Text Block] Note 4 - Investments Insider Trading Policies and Procedures Adopted [Flag] Insider Trading Policies and Procedures Adopted [Flag] Note 5 - Variable Interest Entity Financial Instrument [Axis] Note 6 - Property and Equipment Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Note 7 - Federal, State and Local Income Taxes Note 9 - Lease Commitments Minimum [Member] us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax Total investment in government debt securities, gross unrealized losses Note 11 - Comprehensive Income us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax Total investment in government debt securities, gross unrealized gains Note 13 - Treasury Stock and Repurchase Program Insider Trading Policies and Procedures [Line Items] Statistical Measurement [Domain] Note 1 - Organization and Summary of Significant Accounting Policies - Schedule of Fair Value Measurements of Investments (Details) Maximum [Member] Note 2 - Supplementary Cash Flow Information - Supplementary Cash Flow Elements (Details) Note 3 - Related Party Transactions - Non-voting Revenues Interest and Non-voting Profits Interests (Details) us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic Income before income taxes us-gaap_IncreaseDecreaseInAccountsReceivable Accounts receivable Note 4 - Investments - Schedule of Carrying Value and Fair Value of Equity Securities (Details) Accounts payable & accrued expenses Note 4 - Investments - Schedule of Carrying Value and Fair Value of Securities Available-for-sale (Details) Schedule of Investments [Table] Note 4 - Investments - Income From Securities Transactions (Details) Note 4 - Investments - Components of EAM's Investment Management Operations (Details) Note 4 - Investments - Assets and Liabilities (Details) valu_IncreaseDecreaseInAssetsUnderManagement Increase (Decrease) in Assets under Management This element represents the amount of increase decrease in the value of assets managed by EAM. Note 5 - Variable Interest Entity - Total Assets, the Maximum Exposure to Loss, and Value of the Assets and Liabilities in EAM (Details) Note 6 - Property and Equipment - Components of Property and Equipment (Details) Note 7 - Federal, State and Local Income Taxes - Provision for Income Taxes (Details) valu_PercentageOfAssetsIncreasedDecreasedInUnconsolidatedEntities Percentage of Assets Increased (Decreased) in Unconsolidated Entities Represents the stated percentage of assets increased (decreased) in unconsolidated entities. Note 7 - Federal, State and Local Income Taxes - Deferred Tax Assets and Liabilities (Details) valu_NonVotingRevenuesInterestPercent Non Voting Revenues Interest Percent Represents percentage of non-voting revenues interest. Note 7 - Federal, State and Local Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) Note 9 - Lease Commitments - Future Minimum Payments (Details) us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends Effect of dividends received deductions, percent Note 9 - Lease Commitments - Lease Costs (Details) valu_PercentageOfNonVotingProfitsInterestsDueFromExSubsidiaryPayableToParentUnderAgreement Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement Represents the stated percentage of non voting profits interests due from ex-subsidiary payable to parent under agreement. Note 11 - Comprehensive Income - Components of Comprehensive Income (Details) Available-for-sale Fixed Income securities Note 13 - Treasury Stock and Repurchase Program - Treasury Stock at Cost (Details) Notes To Financial Statements us-gaap_EffectiveIncomeTaxRateContinuingOperations Effective Income Tax Rate Reconciliation, Percent Effective income tax rate, percent Notes To Financial Statements [Abstract] U.S. statutory federal tax rate, percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount As of April 30, 2026 Salaries and employee benefits Income Tax Jurisdiction [Domain] us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable Accrued taxes on income us-gaap_IncreaseDecreaseInIncomeTaxesReceivable Prepaid and refundable income taxes Financial Instruments [Domain] State and local income taxes, net of federal income tax benefit, percent Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Other, net, percent us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) us-gaap_SecurityDeposit Security Deposit Segment Reporting [Text Block] Restricted Assets Disclosure [Text Block] Depreciation and amortization us-gaap_Liabilities Total liabilities EAM's total liabilities As of April 30, 2026 us-gaap_DeconsolidationGainOrLossAmount Deconsolidation, Gain (Loss), Amount us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and shareholders' equity Title and Position [Axis] us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities Total adjustments Segment Reporting [Table] us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Prepaid expenses and other current assets Subsequent Event [Member] Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Domain] Production and distribution Lessee, Lease, Description [Table] Lease Contractual Term [Axis] Lease Contractual Term [Domain] Changes in operating assets and liabilities: us-gaap_FiniteLivedIntangibleAssetUsefulLife Finite-Lived Intangible Asset, Useful Life (Year) Condensed Cash Flow Statement [Table] us-gaap_RestrictedCash Restricted cash us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net change in cash and cash equivalents us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period us-gaap_CashAndCashEquivalentsFairValueDisclosure Cash equivalents valu_NonVotingProfitsInterestPercent Non Voting Profits Interest Percent Represents percentage of non-voting profits interest. New Accounting Pronouncements, Policy [Policy Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Total cash, cash equivalents, and restricted cash shown in the Consolidated Statement of Cash Flows Federal income tax payments Amount represents Federal income tax payments to the Parent. Statement [Table] valu_NonVotingProfitsInterestInVariableEntityNotYetPaid Non Voting Profits Interest in Variable Entity Not yet Paid Represents distributable amounts earned through the balance sheet date, which is included in the Investment in variable interest entity and not yet paid. valu_OwnershipPercentageByParent Ownership Percentage By Parent The parent entity's interest in net assets of the subsidiary, expressed as a percentage. Revenues and profits interests in EAM Trust Revenues and Profits Distribution from Unconsolidated Entity Represents the revenues and profits distribution from unconsolidated entity. us-gaap_OperatingLeasePayments Operating Lease, Payments valu_FairValueOfContributedCapitalAtInception Fair Value of Contributed Capital at Inception Represents the fair value of contributed capital at inception. Fair Value, off-Balance-Sheet Risk [Table] valu_PercentageOfNonVotingProfitInterest Percentage of Non Voting Profit Interest Represents percentage of non-voting profits interest. Profits interest in EAM Trust Non-voting profits interest from EAM Trust Non-voting profits interest in EAM Represents the income received against non voting profits in unconsolidated entity. valu_CashAndLiquidSecuritiesInExcessOfWorkingCapitalRequirementsContributedToCapitalAccount Cash and Liquid Securities in Excess of Working Capital Requirements Contributed to Capital Account Represents the cash and liquid securities in excess of working capital requirements contributed to capital account. valu_NonVotingRevenuesInterestInUnconsolidatedEntity Non-voting revenues interest from EAM Trust Non-voting revenues interest in EAM Represents the income received against non voting revenues in unconsolidated entity. Deferred rent Represents amount of deferred noncash expenses made by entity during period. valu_AccruedNonVotingRevenuesAndNonVotingProfitsInterestsPayable Accrued Non Voting Revenues and Non Voting Profits Interests Payable Sum of the carrying values as of the balance sheet date of accrued payable non-voting revenues and non-voting profits interests. Investment in EAM Trust Equity Method Investments us-gaap_InvestmentsFairValueDisclosure Investments, Fair Value Disclosure Investments, Fair Value Disclosure Equity securities us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment Equity Method Investment, Other-than-Temporary Impairment srt_StockRepurchaseProgramAuthorizedAmount1 Share Repurchase Program, Authorized, Amount Investment gains/(losses) recognized on sales of equity securities during the period us-gaap_EquitySecuritiesFvNiCost Equity Securities, FV-NI, Cost Equity Securities, FV-NI, Gain (Loss) Equity Securities, FV-NI, Gain (Loss) Product and Service [Domain] valu_PercentageOfCopyrightDataFees Percentage of Copyright Data Fees Represents the percentage of copyright data fees during the period. Product and Service [Axis] valu_ThirdPartySponsoredAssetsForCopyrightData Third Party Sponsored Assets for Copyright Data This element represents amount of third party sponsored assets for copyright data. Consolidated Entities [Axis] Consolidated Entities [Domain] Unrealized gains/(losses) recognized on equity securities held at the end of the period us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total undiscounted future minimum lease payments State and local income tax payments Amount represents State and local income tax payments. Weighted-average discount rate Due within 1 year through 5 years, gross unrealized gains Accumulated gross unrealized gains available-for-sale debt securities maturing in the next five fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths 2027 Compensation Related Costs, General [Text Block] us-gaap_OperatingLeaseExpense Operating Lease, Expense Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Assets [Abstract] us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo 2028 Statement [Line Items] Fair Value Hierarchy and NAV [Axis] us-gaap_CommonStockSharesIssued Common Stock, Shares, Issued (in shares) Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] us-gaap_CommonStockSharesAuthorized Common Stock, Shares Authorized (in shares) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Asset Management and Mutual Fund Distribution Subsidiaries [Member] Information related to the company's asset management and mutual fund distribution subsidiaries. valu_EquitySecuritiesFvniAccumulatedGrossUnrealizedGains Equity securities, gross unrealized gains Amount of accumulated unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Balance, aggregate purchase price remaining under the program us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 Share Repurchase Program, Remaining Authorized, Amount valu_EquitySecuritiesFvniAccumulatedGrossUnrealizedLoss Equity securities, gross unrealized losses Amount of accumulated gross unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Former Employee [Member] Information pertaining to a former employee. us-gaap_CommonStockValue Common stock, $0.10 par value; authorized 30,000,000 shares; issued 10,000,000 shares Accounts payable and accrued liabilities Concentration of Credit Risk [Text Block] The entire disclosure related to concentration of credit risk primarily related to cash deposits. Concentration Risk of Financial Instruments with Off-balance Sheet Risk [Text Block] The entire disclosure for concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact related to financial instruments with off-balance sheet risk. us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables Comprehensive Income (Loss) Note [Text Block] us-gaap_ComprehensiveIncomeNetOfTax Comprehensive income Distributions received from EAM Trust The amount of revenues distribution form variable interest entities classified as operating activities. Profits distributions received from EAM Trust The amount of profit distributions from variable interest entities classified as operating activities. Accrued salaries us-gaap_ShortTermInvestments Short-Term Investments Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Concentration Risk [Table] Concentration Risk Type [Axis] valu_DeferredTaxAssetsRightOfUseAsset Right of Use Asset Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from right of use assets. Concentration Risk Disclosure [Text Block] Dividends payable us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Less: difference between undiscounted lease payments & the present value of future lease payments Operating lease obligation-long term us-gaap_OperatingLeaseLiability Operating Lease, Liability Operating lease obligation-short term Concentration Risk Type [Domain] us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis Total investment in government debt securities, amortized cost Income Tax Jurisdiction, Domestic Federal [Member] us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, before Tax, Portion Attributable to Parent Income Tax Jurisdiction, Domestic State and Local [Member] Statement of Stockholders' Equity [Abstract] Statement of Comprehensive Income [Abstract] Loss Contingency Nature [Axis] us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent Equity securities us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent Other Comprehensive Income (Loss), Available-for-Sale Securities, Tax, Portion Attributable to Parent Statement of Cash Flows [Abstract] us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent Other comprehensive income/(loss) Fixed Income Securities [Member] Shareholders' Equity: Equity Components [Axis] Change in unrealized gains/(losses) on Fixed Income securities, net of tax Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Equity Component [Domain] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] AOCI Attributable to Parent [Member] Fair Value, Inputs, Level 1 [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Loss Contingency, Nature [Domain] Property and equipment, net Total property and equipment, net us-gaap_PropertyPlantAndEquipmentGross Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Subsequent Event Type [Domain] Subsequent Event Type [Axis] Comprehensive Income (Loss) [Table Text Block] us-gaap_FurnitureAndFixturesGross Furniture and equipment Deferred income taxes us-gaap_DeferredIncomeTaxLiabilitiesNet Total federal tax liability us-gaap_AccountsReceivableNet Accounts Receivable, after Allowance for Credit Loss Liabilities and Shareholders' Equity Current Liabilities: us-gaap_GainLossOnInvestments Investment (gains)/losses us-gaap_CurrentIncomeTaxExpenseBenefit Current tax expense us-gaap_LiabilitiesCurrent Total current liabilities us-gaap_CurrentFederalTaxExpenseBenefit Federal us-gaap_CurrentStateAndLocalTaxExpenseBenefit State and local Accounts receivable, net of allowance for credit losses of $12 and $16, respectively Treasury Stock [Text Block] Customer Concentration Risk [Member] valu_PolicyTable Purchases of equity securities Proceeds from sales of equity securities Purchases of equity securities Proceeds from Sale of Equity Securities, FV-NI us-gaap_IncomeTaxesPaid Income Taxes Paid Lease, Cost [Table Text Block] Revenue Benchmark [Member] us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Accumulated depreciation and amortization Accumulated other comprehensive income, net of tax valu_LeaseIncentiveReceivable1 Lease Incentive Receivable 1 Amount of lease incentive receivable. Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] valu_LesseeLeasingArrangementsAllowanceSixMonthsOfFreeRentPayment Lessee Leasing Arrangements, Allowance, Six Months of Free Rent Payment The total amount of free rent offered for six months accompanying an allowance arrangement. us-gaap_CashUninsuredAmount Cash, Uninsured Amount Additional paid-in capital Prepaid expenses and other current assets Use of Estimates, Policy [Policy Text Block] AB and Co [Member] Represents AB&Co. Reimbursement for Payments and Services [Member] Represents reimbursement for payments and services. us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Acquisition of property and equipment Lessee, Operating Leases [Text Block] Non-US [Member] us-gaap_MoneyMarketFundsAtCarryingValue Money Market Funds, at Carrying Value Current Assets: us-gaap_AssetsCurrent Total current assets Geographic Concentration Risk [Member] us-gaap_AociTaxAttributableToParent AOCI Tax, Attributable to Parent Related and Nonrelated Parties [Axis] Purchases effected in open market, shares (in shares) us-gaap_TreasuryStockSharesAcquired Purchase of treasury stock (in shares) Treasury Stock, Shares, Acquired Cash Flow, Supplemental Disclosures [Text Block] Cash flows from operating activities: Cash flows from investing activities: us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities Cash flows from financing activities: us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash provided by investing activities us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash used in financing activities Purchases effected in open market, average cost per share (in dollars per share) us-gaap_TreasuryStockAcquiredAverageCostPerShare Shares Acquired, Average Cost Per Share Purchases of Fixed Income securities Proceeds from sales of Fixed Income securities us-gaap_LiabilitiesFairValueDisclosure Liabilities, Fair Value Disclosure Advertising Cost [Policy Text Block] Accounting Policies [Abstract] us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax us-gaap_DebtSecuritiesAvailableForSaleWeightedAverageYield Debt Securities, Available-for-Sale, Weighted Average Yield us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent Accounts Receivable, Allowance for Credit Loss, Current Income Statement [Abstract] Federal us-gaap_DeferredFederalIncomeTaxExpenseBenefit us-gaap_NumberOfReportableSegments Number of Reportable Segments Deferred income taxes Deferred tax expense (benefit): Balance, cost assigned us-gaap_TreasuryStockCommonValue Treasury stock, at cost (613,807 shares and 588,997 shares, respectively) Balance, shares (in shares) us-gaap_TreasuryStockCommonShares Treasury Stock, Common, Shares (in shares) Balance (in shares) Balance (in shares) Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Treasury Stock, Common [Member] Net income Net income EAM's net income us-gaap_AreaOfRealEstateProperty Area of Real Estate Property (Square Foot) One Single Customer [Member] Represents a single customer of the company. Unrealized gain on securities held for sale valu_DeferredTaxAssetsLiabilitiesUnrealizedLossGainOnSecuritiesHeldForSale Unrealized gain/(loss) on securities held for sale The amount of deferred tax liabilities (asset) related to the unrealized loss (gain) on securities held for sale. State and local us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit Accumulated Other Comprehensive Income (Loss) [Table] valu_AvailableforsaleSecuritiesDebtMaturitiesNextTwelveMonthsGrossUnrealizedGains Due within 1 year, gross unrealized gains Accumulated gross unrealized gains available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Income Tax Disclosure [Text Block] valu_AvailableforsaleSecuritiesDebtMaturitiesNextTwelveMonthsGrossUnrealizedLosses Due within 1 year, gross unrealized losses Accumulated gross unrealized losses of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Sublease to American Building Maintenance Industries, Incorporated [Member] Represents a sublease agreement signed with American Building Maintenance Industries, Incorporated. us-gaap_IncomeTaxReconciliationDeductionsDividends Effect of dividends received deductions us-gaap_CapitalizedComputerSoftwareAmortization1 Capitalized Computer Software, Amortization Cash Securing a Letter of Credit Issued as Security Deposit [Member] Related to the portion of cash that has been restricted to secure a letter of credit issued to a sublandlord as a security deposit. valu_BaseRentIncreasePercent Base Rent Increase, Percent Represents base rent increase percentage. Accounting Standards Update and Change in Accounting Principle [Table] Income Tax, Policy [Policy Text Block] U.S. statutory federal tax rate us-gaap_DeferredTaxAssetsOther Other us-gaap_RelatedPartyTransactionAmountsOfTransaction Related Party Transaction, Amounts of Transaction Related and Nonrelated Parties [Domain] Purchases effected in open market, cost assigned us-gaap_TreasuryStockValueAcquiredCostMethod Purchase of treasury stock Treasury Stock, Value, Acquired, Cost Method Related Party Transaction [Table] Related Party Transactions Disclosure [Text Block] State and local income taxes, net of federal income tax benefit Other, net Class of Treasury Stock [Table Text Block] Fair Value Hierarchy and NAV [Domain] us-gaap_OpenTaxYear Open Tax Year Statement of Financial Position [Abstract] us-gaap_LiabilitiesNoncurrent Total long term liabilities Schedule of Variable Interest Entities [Table Text Block] us-gaap_AssetsNoncurrent Total long term assets Long term assets: Class of Treasury Stock [Table] Prepaid and refundable income taxes us-gaap_DividendsCommonStock Dividends declared Advertising and promotion Variable Interest Entity, Not Primary Beneficiary [Member] Long term liabilities: Variable Interest Entity [Table] us-gaap_IncreaseDecreaseInAccruedSalaries Accrued salaries us-gaap_AssetsUnderManagementCarryingAmount Assets under Management, Carrying Amount valu_OperatingLeasesAnnualBaseRent Operating Leases, Annual Base Rent The amount of base rent per annum during the period for an operating lease. us-gaap_PaymentsForRepurchaseOfCommonStock Purchase of treasury stock at cost dei_DocumentType Document Type Expenses: Document Information [Line Items] us-gaap_ConcentrationRiskPercentage1 Concentration Risk, Percentage dei_DocumentAnnualReport Document Annual Report Unearned revenue us-gaap_DeferredRevenueNoncurrent Weighted-average remaining lease term (in years) (Year) Document Information [Table] dei_EntityInteractiveDataCurrent Entity Interactive Data Current dei_DocumentTransitionReport Document Transition Report dei_DocumentFinStmtErrorCorrectionFlag Document Financial Statement Error Correction [Flag] us-gaap_OperatingExpenses Total expenses Weighted average number of common shares (in shares) Earnings per share, basic & fully diluted (in dollars per share) Title and Position [Domain] us-gaap_TaxJurisdictionOfDomicileExtensibleEnumeration Tax Jurisdiction of Domicile [Extensible Enumeration] Earnings Per Share, Policy [Policy Text Block] Income Tax Jurisdiction [Axis] Change in unrealized gains on Fixed Income securities, net of taxes Amount, after tax and reclassification adjustment, of gain (loss) in value of unsold investment in debt security measured at fair value with change in fair value recognized in accumulated other comprehensive income, attributable to parent. dei_IcfrAuditorAttestationFlag ICFR Auditor Attestation Flag us-gaap_BuildingsAndImprovementsGross Building and leasehold improvements Document Fiscal Period Focus Customer [Domain] Document Fiscal Year Focus Investment, Name [Domain] Restrictions on Cash and Cash Equivalents [Table] Amendment Flag Restricted Cash and Cash Equivalents [Axis] Common Stock [Member] dei_DocumentPeriodEndDate Document Period End Date Property, Plant, and Equipment [Text Block] Legal Entity [Axis] dei_EntityFileNumber Entity File Number dei_EntityTaxIdentificationNumber Entity Tax Identification Number valu_LesseeLeasingArrangementsAllowance Lessee Leasing Arrangements, Allowance Represents the amount of allowance to be applied against the lessee's costs and expenses. Entity [Domain] Entity Central Index Key dei_EntityRegistrantName Entity Registrant Name dei_EntityWellKnownSeasonedIssuer Entity Well-known Seasoned Issuer dei_EntityCurrentReportingStatus Entity Current Reporting Status dei_EntityVoluntaryFilers Entity Voluntary Filers dei_EntityIncorporationStateCountryCode Entity Incorporation, State or Country Code Current Fiscal Year End Date dei_EntityPublicFloat Entity Public Float Fair Value Measurement, Policy [Policy Text Block] dei_EntityFilerCategory Entity Filer Category dei_EntityShellCompany Entity Shell Company dei_EntityEmergingGrowthCompany Entity Emerging Growth Company dei_EntitySmallBusiness Entity Small Business us-gaap_OperatingIncomeLoss Income from operations Cash and Cash Equivalents [Domain] Revenues: dei_EntityAddressStateOrProvince Entity Address, State or Province dei_EntityAddressCityOrTown Entity Address, City or Town Retained earnings dei_EntityAddressAddressLine1 Entity Address, Address Line One dei_CityAreaCode City Area Code us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost Due within 1 year through 5 years, amortized cost dei_LocalPhoneNumber Local Phone Number us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost Due within 1 year, amortized cost dei_EntityAddressPostalZipCode Entity Address, Postal Zip Code dei_Security12bTitle Title of 12(b) Security dei_SecurityExchangeName Security Exchange Name dei_TradingSymbol Trading Symbol us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue Due within 1 year, fair value us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue Due within 1 year through 5 years, fair value Class of Stock [Axis] us-gaap_AvailableForSaleSecuritiesDebtSecurities Available-for-sale fixed income securities Total investment in government debt securities, fair value Revenue [Policy Text Block] Related Party Transaction [Domain] Schedule of Non Voting Revenues Interest and Non Voting Profits Interests [Table Text Block] Schedule of non voting revenues interest and non voting profits interests. dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) Other comprehensive income/(loss), net of tax: Related Party Transaction [Axis] us-gaap_PaymentsForSoftware Expenditures for capitalized software us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Change in unrealized gains on available-for-sale fixed income securities Other This item represents investment income (expense) derived from investments in debt and equity securities unless specified in taxonomy. us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax Change in unrealized gains on available-for-sale fixed income securities us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax Change in unrealized gains on available-for-sale fixed income securities Investment management fee waivers and reimbursements Represents the portion of revenue recognized on waiver of the investment management fees during the period. 12b-1 fee waivers Represents the portion of revenue recognized on waiver of all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1. Variable Interest Entity [Text Block] The entire disclosure for Categorization of Variable Interest Entities (VIE) for consolidation and (or) disclosure purposes, whether individually or in aggregate, by: (1) VIEs consolidated because the entity is the primary beneficiary, (2) VIEs not consolidated because the entity is not the primary beneficiary, and (3) VIEs or potential VIEs that are not consolidated because necessary information is not available. In general, a VIE is a corporation, partnership, trust, or any other legal structure used for business purposes that either (a) does not have equity investors with voting rights or (b) has equity investors that do not provide sufficient financial resources for the entity to support its activities. A VIE often holds financial assets, including loans or receivables, real estate or other property. A VIE may be essentially passive or it may engage in research and development or other activities on behalf of another company. EAM Trust [Member] Represents the investment management operations of EULAV Asset Management LLC. Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] us-gaap_CapitalizedComputerSoftwareAdditions Capitalized Cost, Software to be Sold, Leased, or Marketed, Addition Accrued taxes on income Office and administration Deferred gain on deconsolidation of EAM Amount of deferred tax liability attributable to taxable temporary differences from deferred gain on deconsolidation of subsidiary, expected to be realized or consumed after one year (or the normal operating cycle, if longer). valu_DeferredTaxAssetsDeferredChargesCurrent Deferred charges Amount deferred tax asset attributable to deductible temporary differences from deferred charges, expected to be realized or consumed within one year or operating cycle, if longer. Deferred non-cash post-employment compensation Deferred Tax Assets, Deferred Non Cash Postemployment Compensation, Noncurrent Amount of deferred tax asset attributable to deductible temporary differences from deferred non-cash postemployment compensation, expected to be realized or consumed after one year (or the normal operating cycle, if longer). Capitalized software and other intangible assets, net Property, Plant, and Equipment [Table] valu_DeferredTaxAssetsLiabilitiesDepreciationAndAmortizationNoncurrent Depreciation and amortization Amount of deferred tax (asset) liability attributable to deductible temporary differences from depreciation and amortization, expected to be realized or consumed after one year (or the normal operating cycle, if longer). us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer Deferred Compensation Arrangement with Individual, Contributions by Employer us-gaap_CommonStockParOrStatedValuePerShare Common Stock, Par or Stated Value Per Share (in dollars per share) Investment, Name [Axis] Other income Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] EAM's total assets us-gaap_Assets Total assets As of April 30, 2026 Cash and Cash Equivalents, Policy [Policy Text Block] us-gaap_CashAndCashEquivalentsAtCarryingValue Cash and cash equivalents (including short term investments of $23,733 and $33,615, respectively) dei_AuditorFirmId Auditor Firm ID dei_AuditorName Auditor Name Geographical [Domain] dei_AuditorLocation Auditor Location Geographical [Axis] valu_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsGrossUnrealizedLosses Due within 1 year through 5 years, gross unrealized losses Accumulated gross unrealized losses of available-for-sale debt securities maturing in the next five fiscal years following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Customer [Axis] Unearned revenue us-gaap_DepreciationDepletionAndAmortization Depreciation and amortization Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Internal Use Software Disclosure [Text Block] Disclosure of accounting policy for its computer software activities including the accounting treatment for costs incurred for (1) research and development activities, (2) development of computer software for internal use, (3) in-process research and development acquired in a purchase business combination. Closing of Signature Bank [Member] Relating to the closing of signature bank. Consolidation, Policy [Policy Text Block] Dividend income License [Member] Balance, average cost per share (in dollars per share) valu_TreasuryStockAverageCostPerShare Represents the average cost per share. Interest income Investment Income [Table Text Block] Federal Income Tax Note [Table] Intangible Asset, Finite-Lived [Table] Subscription and Circulation [Member] EAM's total equity us-gaap_StockholdersEquity Total shareholders' equity Balance Balance us-gaap_IncreaseDecreaseInContractWithCustomerLiability Unearned revenue Copyright Data Fees [Text Block] Represents the information about copyright data fees. Award Timing MNPI Disclosure [Text Block] us-gaap_PaymentsOfDividendsCommonStock Dividends paid ecd_AwardTmgMnpiCnsdrdFlag Award Timing MNPI Considered [Flag] Award Timing Disclosures [Line Items] Value Line Distribution Center ("VLDC") [Member] Represents company's subsidiary which is Value Line Distribution Center ("VLDC") . Concentration Risk Benchmark [Axis] Seagis Property Group LP (the "Landlord") [Member] Represents Seagis Property Group LP (the "Landlord"). Concentration Risk Benchmark [Domain] Distribution and Shareholder Service [Member] Exchange Traded Funds [Member] Operating lease - right-of-use asset Operating Lease, Right-of-Use Asset ecd_Rule10b51ArrTrmntdFlag false Property, Plant, and Equipment [Table Text Block] Revenues us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax Revenue from Contract with Customer, Including Assessed Tax ecd_Rule10b51ArrAdoptedFlag false Investment Holdings, Other than Securities [Table Text Block] Summary Investment Holdings [Table Text Block]