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Related Party Transactions (Detail Textuals 1) (USD $) In Millions, unless otherwise specified | Dec. 16, 2011 Value Line Convertible Fund | May 18, 2012 Value Line New York Tax Exempt Trust | May 18, 2012 Value Line Tax Exempt Fund | Mar. 31, 2013 Value Line Core Bond Fund Subsequent Event
--- | --- | --- | --- | ---
Related Party Transaction [Line Items] |  |  |  |
Assets under management | $ 20 | $ 15 | $ 90 |
Minimum expected asset under management carrying value |  |  |  | $ 100

X
- Definition The carrying amount of assets an investment adviser manages on behalf of investors. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum expected carrying amount of assets an investment adviser manages on behalf of investors. + References No definition available. + Details
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Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant