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Investments - Components of assets and liabilities (Details 3) (EAM Trust, USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Apr. 30, 2014
EAM Trust
    
Schedule of Investments [Line Items]    
EAM's total assets $ 60,112us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= valu_EulavAssetManagementLlcMember		 $ 59,965us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= valu_EulavAssetManagementLlcMember
EAM's total liabilities (3,117)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= valu_EulavAssetManagementLlcMember		 [1] (3,158)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= valu_EulavAssetManagementLlcMember		 [1]
EAM's total equity $ 56,995us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= valu_EulavAssetManagementLlcMember		 $ 56,807us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= valu_EulavAssetManagementLlcMember
[1] At January 31, 2015 and April 30, 2014, EAM's total liabilities included a payable to VLI for its distributable share of accrued non-voting revenues and non-voting profits interests of $2,008,000 and $1,887,000, respectively.