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Related Party Transactions (Detail Textuals) (USD $)
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Value Line Inc
Oct. 31, 2013
Value Line Inc
Oct. 31, 2014
EAM Trust
Jul. 31, 2014
EAM Trust
Oct. 31, 2014
EAM Trust
Apr. 30, 2014
EAM Trust
Oct. 31, 2013
EAM Trust
Oct. 31, 2015
EAM Trust
Subsequent Event
Jul. 31, 2015
EAM Trust
Subsequent Event
Oct. 31, 2014
EAM Trust
Minimum
Oct. 31, 2014
EAM Trust
Maximum
Related Party Transaction [Line Items]                          
Total assets of value line funds managed by EAM         $ 2,390,000,000   $ 2,390,000,000   $ 2,320,000,000        
Percentage of assets increased in funds             3.00%            
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%            
Percentage of non-voting revenues interest in unconsolidated entity         47.27% 46.66%       49.63% 49.18%    
Non voting profits interest in variable entity not yet paid         1,935,000   1,935,000 1,887,000          
Reimbursed income     71,000 101,000                  
Federal income tax payments to the Parent $ 1,850,000 $ 354,000                      
Percentage of ownership in outstanding shares of common stock of the company by parent         87.98%   87.98%