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Note F - Debt Facilities (Tables)
9 Months Ended
Jan. 31, 2013
Schedule of Long-term Debt Instruments [Table Text Block]
(In thousands)
                         
                 
Balance at
 
   
Aggregate
Amount
   
Interest
Rate
 
Maturity
 
January 31, 2013
   
April 30, 2012
 
                           
Revolving credit facilities
  $ 145,000    
LIBOR + 2.5%
 
March 2015
  $ 109,274     $ 77,900