Expenses for Settlement (Detail Textuals) (Value line funds, USD $)	12 Months Ended
Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Value line funds
Restructuring Cost and Reserve [Line Items]
Payment to administrator of fair fund	$ 156,000	$ 32,000	$ 1,189,000
Outstanding provision for settlement reflected as liability	$ 250,000

The aggregate amount provided for estimated restructuring charges, remediation costs, and asset impairment loss during an accounting period. Generally, these items are either unusual or infrequent, but not both (in which case they would be extraordinary items).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Name:	us-gaap_RestructuringSettlementAndImpairmentProvisions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration