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Note F - Debt Facilities (Tables)
 3 Months Ended
Jul. 31, 2017
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
(In thousands)            
    Aggregate   Interest       Balance at
    Amount   Rate   Maturity   July 31, 2017   April 30, 2017
                                         
Revolving credit facilities   $
200,000
      
LIBOR + 2.375%
      
December 12, 2019
     $
117,822
     $
118,124
  
     
 
      
(3.61% at July 31, 2017 and 3.37% at April 30, 2017)