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Variable Interest Entity (Tables)
9 Months Ended
Jan. 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 January 31, 2015 (unaudited)
  $ 60,112     $ 58,066     $ -     $ 58,066  
As of April 30, 2014
  $ 59,965     $ 57,850     $ -     $ 57,850  
 
(1)  Reported within Long Term Assets on the Consolidated Condensed Balance Sheets.