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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
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EAM Trust |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
EAM's total assets | $ 60,112 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |  | $ 59,965 us-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 | $ 56,995 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |  | $ 56,807 us-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.

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