Related Party Transactions (Detail Textuals) (USD $)	12 Months Ended								3 Months Ended								12 Months Ended			12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2014 Value Line Inc	Apr. 30, 2013 Value Line Inc	Apr. 30, 2012 Value Line Inc	Apr. 30, 2014 Value Line Inc Investment In EAM Trust	Apr. 30, 2013 Value Line Inc Investment In EAM Trust	Apr. 30, 2014 EAM Trust	Jan. 31, 2014 EAM Trust	Oct. 31, 2013 EAM Trust	Jul. 31, 2013 EAM Trust	Apr. 30, 2013 EAM Trust	Jan. 31, 2013 EAM Trust	Oct. 31, 2012 EAM Trust	Jul. 31, 2012 EAM Trust	Apr. 30, 2014 EAM Trust	Apr. 30, 2013 EAM Trust	Apr. 30, 2012 EAM Trust	Apr. 30, 2014 EAM Trust Minimum	Apr. 30, 2014 EAM Trust Maximum
Related Party Transaction [Line Items]
Total assets of value line funds managed by EAM									$ 2,350,000,000				$ 2,190,000,000				$ 2,350,000,000	$ 2,190,000,000	$ 2,110,000,000
Increase in the value of assets managed by EAM																	164,000,000	800,000,000
Percentage of assets increased in funds																	7.50%	3.80%
Percentage of non voting profits interests due each quarter from EAM																	90.00%
Non-voting profits interest in EAM																	50.00%
Non voting profits interest in variable entity not yet paid							1,887,000	1,621,000
Investment management fee revenues from its mutual fund and separate accounts business																				41.00%	55.00%
Reimbursed income				220,000	220,000	268,000
Federal income tax payments to the Parent	$ 2,254,000	$ 1,877,000	$ 845,000
Percentage of ownership in outstanding shares of common stock of the Company by parent				87.90%
Percentage of non-voting revenues interest in unconsolidated entity									48.66%	47.91%	47.27%	46.66%	46.47%	46.15%	45.87%	46.20%