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Note F - Debt Facilities (Tables)
9 Months Ended
Jan. 31, 2018
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
    Aggregate   Interest       Balance at
    Amount   Rate   Maturity   January 31, 2018   April 30, 2017
Revolving credit facilities   $
200,000
   
LIBOR + 2.35%
 
December 12, 2019
  $
147,191
    $
118,124