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Related Party Transactions (Detail Textuals) (USD $)
 9 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Value Line Inc
Jan. 31, 2013
Value Line Inc
Jan. 31, 2014
Value Line Inc
Investment in EAM Trust
Apr. 30, 2013
Value Line Inc
Investment in EAM Trust
Jan. 31, 2014
EAM Trust
Oct. 31, 2013
EAM Trust
Jul. 31, 2013
EAM Trust
Jan. 31, 2013
EAM Trust
Oct. 31, 2012
EAM Trust
Jul. 31, 2012
EAM Trust
Jan. 31, 2014
EAM Trust
Jan. 31, 2014
EAM Trust
Minimum
Jan. 31, 2014
EAM Trust
Maximum
Related Party Transaction [Line Items]                              
Total assets of value line funds managed by EAM             $ 2,300,000,000     $ 2,100,000,000     $ 2,300,000,000    
Percentage of assets increased in funds                         8.30%    
Investment management fee revenues from its mutual fund and separate accounts business                           41.00% 55.00%
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         1,953,000 1,621,000                  
Reimbursed income     113,000 138,000                      
Federal income tax payments to the parent $ 1,054,000 $ 1,030,000                          
Percentage of ownership in outstanding shares of common stock of the company by parent     87.91%                        
Percentage of non-voting revenues interest in unconsolidated entity             47.91% 47.27% 46.66% 46.15% 45.87% 46.20%