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Note F - Debt Facilities (Tables)
 12 Months Ended
Apr. 30, 2017
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
(In thousands)            
    Aggregate   Interest       Balance at
    Amount   Rate   Maturity   April 30, 2017   April 30, 2016
                     
Revolving credit facilities   $
200,000
      
LIBOR + 2.375%
      
December 12, 2019
     $
118,124
 
   $
107,386
  
     
 
      
( 3.37% at April 30, 2017 and 2.81% at April 30, 2016)