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Variable Interest Entity (Tables)
3 Months Ended
Jul. 31, 2012
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, 2012
  $ 58,838     $ 57,306     $ -     $ 57,306  
As of April 30, 2012
  $ 57,482     $ 56,331     $ -     $ 56,331  
 
(1) Reported within Long Term Assets on the Consolidated Condensed Balance Sheets.