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Variable Interest Entity (Tables)
12 Months Ended
Apr. 30, 2014
Variable Interest Entity [Abstract]  
Schedule of total assets, the maximum exposure to loss, value of the assets and liabilities in EAM
                                 
          Value Line  
         
Investment in
         
Maximum
 
 
       
EAM Trust
   
Liabilities
   
Exposure to
 
($ in thousands)
 
VIE Assets
    (1)          
Loss
 
As of April 30, 2014
  $ 59,965     $ 57,850     $ -     $ 57,850  
As of April 30, 2013
  $ 59,349     $ 57,511     $ -     $ 57,511  
 
(1) Reported within Long Term Assets on Consolidated Balance Sheets.