Related Party Transactions (Detail Textuals 1) (Value Line Core Bond Fund, USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Value Line Core Bond Fund
Related Party Transaction [Line Items]
Assets under management	$ 100

The carrying amount of assets an investment adviser manages on behalf of investors.

No definition available.

Name:	us-gaap_AssetsUnderManagementCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant