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Related Party Transactions (Detail Textuals) - USD ($)	3 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Apr. 30, 2015
EAM Trust
Related Party Transaction [Line Items]
Total assets of value line funds managed by EAM	$ 2,360,000,000	$ 2,310,000,000
Percentage of assets increased in funds	2.10%
Percentage of non voting profits interests due each quarter from EAM	90.00%
Non-voting profits interest in EAM	50.00%
Percentage of non-voting revenues interest in unconsolidated entity	50.05%	49.18%
Non voting profits interest in variable entity not yet paid	$ 2,037,000		$ 1,951,000
EAM Trust | Minimum
Related Party Transaction [Line Items]
Investment management fee revenues from its mutual fund and separate accounts business	41.00%
EAM Trust | Maximum
Related Party Transaction [Line Items]
Investment management fee revenues from its mutual fund and separate accounts business	55.00%
Value Line Inc
Related Party Transaction [Line Items]
Reimbursed income	$ 31,000	$ 41,000
Percentage of ownership in outstanding shares of common stock of the company by parent	88.12%

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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 210.5-03.1)



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



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 605



-SubTopic 45



-Section 45



-Paragraph 23



-URI http://asc.fasb.org/extlink&oid=51671805&loc=d3e60722-111653

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