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Variable Interest Entity (Tables)
9 Months Ended
Jan. 31, 2016
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 January 31, 2016 (unaudited)   $ 60,259     $ 58,079     $ -     $ 58,079  
As of April 30, 2015   $ 60,159     $ 58,048     $ -     $ 58,048  

 

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