Related Party Transactions (Detail Textuals) (USD $)	6 Months Ended						6 Months Ended		6 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013 Value Line Inc	Oct. 31, 2012 Value Line Inc	Oct. 31, 2013 Value Line Inc Investment in EAM Trust	Apr. 30, 2013 Value Line Inc Investment in EAM Trust	Oct. 31, 2013 EAM Trust	Oct. 31, 2012 EAM Trust	Oct. 31, 2013 EAM Trust Minimum	Oct. 31, 2013 EAM Trust Maximum
Related Party Transaction [Line Items]
Total assets of value line funds managed by EAM							$ 2,300,000,000	$ 2,000,000,000
Percentage of assets increased in funds							13.20%
Percentage of non voting profits interests due each quarter from EAM							90.00%
Non voting profits interest in variable entity not yet paid					1,835,000	1,621,000
Investment management fee revenues from its mutual fund and separate accounts business									41.00%	55.00%
Reimbursed income			101,000	88,000
Percentage of ownership in outstanding shares of common stock of the company by parent			87.77%
Federal income tax payments to the parent	$ 354,000	$ 230,000