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Defined Benefit Pension Plans (Tables)
6 Months Ended
Oct. 31, 2012
Defined Benefit Pension Plans [Abstract]  
Pension Expenses
                 
    Three months ended
October 31, 2012
    Three months ended
October 31, 2011
 

Service cost

  $ -0-     $ -0-  

Interest cost

    226       235  

Expected return on plan assets

    (305     (326

Recognition of net loss

    276       179  
   

 

 

   

 

 

 

Net periodic pension expense

  $ 197     $ 88  
   

 

 

   

 

 

 
     
    Six months ended
October 31, 2012
    Six months ended
October 31, 2011
 

Service cost

  $ -0-     $ -0-  

Interest cost

    453       470  

Expected return on plan assets

    (607     (652

Recognition of net loss

    551       358  
   

 

 

   

 

 

 

Net periodic pension expense

  $ 397     $ 176