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Note F - Debt Facilities (Tables)
12 Months Ended
Apr. 30, 2013
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
(In thousands)
                       
    Aggregate   Interest      
Balance at
 
   
Amount
 
Rate
 
Maturity
 
April 30, 2013
   
April 30, 2012
 
                         
Revolving credit facilities
  $ 145,000  
LIBOR + 2.5%
 
March 2015
  $ 99,563     $ 77,900