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Variable Interest Entity (Tables)
3 Months Ended
Jul. 31, 2013
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, 2013 (unaudited)
  $ 59,261     $ 57,660     $ -     $ 57,660  
As of April 30, 2013
  $ 59,349     $ 57,511     $ -     $ 57,511  
 
(1)  Reported within Long Term Assets on the Consolidated Condensed Balance Sheets.