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Investments (Detail Textuals) (USD $)	9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Apr. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Aggregate cost of equity securities available for sale	$ 8,871,000us-gaap_AvailableForSaleSecuritiesAmortizedCost		$ 8,847,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
Fair value of equity securities	9,200,000us-gaap_AvailableForSaleSecurities		9,226,000us-gaap_AvailableForSaleSecurities
Decrease in gross unrealized gains on equity securities classified as available-for-sale	(51,000)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	(74,000)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Decrease in gross unrealized gains on equity securities classified as available-for-sale	(51,000)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	(74,000)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Deferred taxes on unrealized gains on securities	18,000valu_DeferredTaxesOnUnrealizedGainsOnSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	26,000valu_DeferredTaxesOnUnrealizedGainsOnSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Accumulated other comprehensive income included unrealized gains, net of tax	329,000us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember		379,000us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Deferred taxes on accumulated other comprehensive income	$ 116,000us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember		$ 133,000us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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