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Note F - Debt Facilities (Tables)
 3 Months Ended
Jul. 31, 2015
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
(In thousands)
                                        
      Aggregate       Interest               Balance at  
Amount Rate Maturity July 31, 2015 April 30, 2015
Revolving credit facilities   $ 145,000       LIBOR + 2.375%       October 8, 2017     $ 105,410     $ 102,685  
      (2.44% at July 31, 2015 and 2.56% at April 30, 2015)