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Variable Interest Entity - Total assets of EAM, maximum exposure to loss due to involvement with EAM and value of assets and liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Apr. 30, 2014
Variable Interest Entity [Line Items]    
Investment in EAM Trust $ 58,066us-gaap_EquityMethodInvestments $ 57,850us-gaap_EquityMethodInvestments
EAM Trust    
Variable Interest Entity [Line Items]    
VIE Assets 60,112us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= valu_EulavAssetManagementLlcMember
59,965us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= valu_EulavAssetManagementLlcMember
Investment in EAM Trust 58,066us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= valu_EulavAssetManagementLlcMember
[1] 57,850us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= valu_EulavAssetManagementLlcMember
[1]
Liabilities      
Maximum Exposure to Loss $ 58,066us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= valu_EulavAssetManagementLlcMember
$ 57,850us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= valu_EulavAssetManagementLlcMember
[1] Reported within Long Term Assets on the Consolidated Condensed Balance Sheets.