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Related Party Transactions (Tables)
 3 Months Ended
Jul. 31, 2015
Related Party Transactions [Abstract]  
Schedule of non voting revenues interest and non voting profits interests

                 
  Three Months Ended July 31,  
($ in thousands)   2015     2014  
Non-voting revenues interest in EAM   $ 1,902     $ 1,833  
Non-voting profits interest in EAM     140       189  
    $ 2,042     $ 2,022