Related Party Transactions (Detail Textuals) (USD $)	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Apr. 30, 2014
Related Party Transaction [Line Items]
Federal income tax payments to the Parent
Value Line Inc
Related Party Transaction [Line Items]
Reimbursed income	41,000	51,000
EAM Trust
Related Party Transaction [Line Items]
Total assets of value line funds managed by EAM	2,300,000,000	2,200,000,000
Percentage of assets increased in funds	3.50%
Non-voting profits interest in EAM	50.00%
Percentage of non-voting revenues interest in unconsolidated entity	49.18%	46.66%
Non voting profits interest in variable entity not yet paid	$ 1,833,000		$ 1,887,000
Percentage of ownership in outstanding shares of common stock of the company by parent	87.98%
EAM Trust | Minimum
Related Party Transaction [Line Items]
Investment management fee revenues from its mutual fund and separate accounts business	41.00%
Percentage of non voting profits interests due each quarter from EAM	90.00%
EAM Trust | Maximum
Related Party Transaction [Line Items]
Investment management fee revenues from its mutual fund and separate accounts business	55.00%