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Note F- Debt Facilities (Tables)
9 Months Ended
Jan. 31, 2016
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
(In thousands)                    
  Aggregate   Interest       Balance at
  Amount   Rate   Maturity   January 31, 2016   April 30, 2015
Revolving credit facilities   $ 145,000     LIBOR + 2.375%     October 8, 2017     $ 122,490     $ 102,221  
      (2.67% at January 31, 2016 and 2.56% at April 30, 2015)