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Investments - Composition of income from securities transactions (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Jan. 31, 2014
Investments, Debt and Equity Securities [Abstract]        
Dividend income $ 42us-gaap_InvestmentIncomeDividend $ 36us-gaap_InvestmentIncomeDividend $ 119us-gaap_InvestmentIncomeDividend $ 109us-gaap_InvestmentIncomeDividend
Capital gain distributions from ETF's 57us-gaap_GainLossOnInvestments 36us-gaap_GainLossOnInvestments 57us-gaap_GainLossOnInvestments 36us-gaap_GainLossOnInvestments
Interest income    1us-gaap_InvestmentIncomeInterest 3us-gaap_InvestmentIncomeInterest 2us-gaap_InvestmentIncomeInterest
Other (3)valu_InvestmentIncomeExpenseOther (3)valu_InvestmentIncomeExpenseOther 24valu_InvestmentIncomeExpenseOther (5)valu_InvestmentIncomeExpenseOther
Total income from securities transactions, net $ 96us-gaap_InvestmentIncomeNet $ 70us-gaap_InvestmentIncomeNet $ 203us-gaap_InvestmentIncomeNet $ 142us-gaap_InvestmentIncomeNet