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Related Party Transactions (Detail Textuals 1) (USD $) In Millions, unless otherwise specified | May 31, 2012 | Dec. 31, 2011 Value Line Convertible Fund | May 31, 2012 Value Line New York Tax Exempt Trust | May 31, 2012 Value Line Tax Exempt Fund | Mar. 31, 2013 Value Line Core Bond Fund
--- | --- | --- | --- | --- | ---
Related Party Transaction [Line Items] |  |  |  |  |
Assets under management | $ 20 | $ 20 | $ 15 | $ 90 | $ 100

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- Definition The carrying amount of assets an investment adviser manages on behalf of investors. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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Balance Type: | na
Period Type: | duration