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Note F - Debt Facilities (Tables)
9 Months Ended
Jan. 31, 2014
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
(In thousands)
 
         
 
     
Balance at
 
   
Aggregate
Amount
   
Interest
Rate
 
Maturity
 
January 31, 2014
   
April 30, 2013
 
                               
Revolving credit facilities
  $ 145,000    
LIBOR + 2.25%
 
June 2016
    $ 114,339       $ 99,563