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Note F - Debt Facilities (Tables)
6 Months Ended
Oct. 31, 2014
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
(In thousands)
                       
    Aggregate  
Interest
     
Balance at
 
    Amount     Rate  
Maturity
 
October 31, 2014
   
April 30, 2014
 
                         
Revolving credit facilities
  $ 145,000    LIBOR + 2.375%  
October 8, 2017
  $ 106,497     $ 97,032