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Investments - Carrying value and fair value of securities available-for-sale (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Apr. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 8,871us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 8,847us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains 1,573valu_AvailableForSaleDebtSecuritiesGrossUnrealizedGainAccumulatedInInvestment 1,327valu_AvailableForSaleDebtSecuritiesGrossUnrealizedGainAccumulatedInInvestment
Gross Unrealized Losses (1,244)valu_AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedInInvestment (948)valu_AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedInInvestment
Fair Value 9,200us-gaap_AvailableForSaleSecurities 9,226us-gaap_AvailableForSaleSecurities
Common stocks    
Schedule of Available-for-sale Securities [Line Items]    
Cost 101us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
101us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
Gross Unrealized Gains 68valu_AvailableForSaleDebtSecuritiesGrossUnrealizedGainAccumulatedInInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
47valu_AvailableForSaleDebtSecuritiesGrossUnrealizedGainAccumulatedInInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
Gross Unrealized Losses (17)valu_AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedInInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
(12)valu_AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedInInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
Fair Value 152us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
136us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
ETFs - equities    
Schedule of Available-for-sale Securities [Line Items]    
Cost 3,902us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ExchangeTradedFundsMember
3,878us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ExchangeTradedFundsMember
Gross Unrealized Gains 1,505valu_AvailableForSaleDebtSecuritiesGrossUnrealizedGainAccumulatedInInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ExchangeTradedFundsMember
1,280valu_AvailableForSaleDebtSecuritiesGrossUnrealizedGainAccumulatedInInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ExchangeTradedFundsMember
Gross Unrealized Losses (1)valu_AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedInInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ExchangeTradedFundsMember
(2)valu_AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedInInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ExchangeTradedFundsMember
Fair Value 5,406us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ExchangeTradedFundsMember
5,156us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ExchangeTradedFundsMember
Inverse ETFs - equities    
Schedule of Available-for-sale Securities [Line Items]    
Cost 4,868us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= valu_InverseExchangeTradedFundsMember
4,868us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= valu_InverseExchangeTradedFundsMember
Gross Unrealized Gains      
Gross Unrealized Losses (1,226)valu_AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedInInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= valu_InverseExchangeTradedFundsMember
(934)valu_AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedInInvestment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= valu_InverseExchangeTradedFundsMember
Fair Value $ 3,642us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= valu_InverseExchangeTradedFundsMember
$ 3,934us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= valu_InverseExchangeTradedFundsMember