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Note F - Debt Facilities (Tables)
3 Months Ended
Jul. 31, 2012
Schedule of Long-term Debt Instruments [Table Text Block]
(In thousands)
             
   
Aggregate
 
Interest
     
Balance at
 
   
Amount
 
Rate
 
Maturity
 
July 31, 2012
   
April 30, 2012
 
                         
Revolving credit facilities
  $ 125,000  
LIBOR + 2.5%
 
March 2015
  $ 85,208     $ 77,900  
         
(2.75% at July 31, 2012 and 2.74% at April 30, 2012)