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Note F - Debt Facilities (Tables)
3 Months Ended
Jul. 31, 2014
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
(In thousands)
                       
   
Aggregate
 
Interest
     
Balance at
 
    Amount  
Rate
 
Maturity
 
July 31, 2014
   
April 30, 2014
 
                         
Revolving credit facilities
  $ 145,000  
LIBOR + 2.25%
 
June 24, 2016
  $ 94,220     $ 97,032