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Variable Interest Entity (Tables)
3 Months Ended
Jul. 31, 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 July 31, 2015 (unaudited)   $ 60,167     $ 58,154     $ -     $ 58,154  
As of April 30, 2015   $ 60,159     $ 58,048     $ -     $ 58,048  

 

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