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Variable Interest Entity (Tables)
12 Months Ended
Apr. 30, 2015
Variable Interest Entity [Abstract]  
Schedule of total assets, the maximum exposure to loss, value of the assets and liabilities in EAM
          Value Line  
 ($ in thousands)   VIE Assets     Investment in EAM Trust 
(1)
    Liabilities     Maximum Exposure to 
Loss
 
As of April 30, 2015   $ 60,159     $ 58,048     $ -     $ 58,048  
As of April 30, 2014   $ 59,965     $ 57,850     $ -     $ 57,850  
                                 

(1)  Reported within Long Term Assets on Consolidated Balance Sheets.