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Note 5 - Derivative Financial Instruments (Tables)
 6 Months Ended
Oct. 28, 2017
Notes Tables  
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]
   
(In thousands)
  
   
Three Months
Ended
    
Six Months Ended
  
   
201
7
    
201
6
    
201
7
    
201
6
  
Recognized in AOCI:
                                
Gain (loss) before income taxes
   $
5,523
     $
253
     $
4,556
     $
(197
 )
Less income tax
provision (benefit)
    
2,049
      
94
      
1,690
      
(73
 )
Net
   $
3,474
     $
159
     $
2,866
     $
(124
 )
Reclassified from AOCI to cost of sales:
                                
Gain (loss) before income taxes
   $
362
     $
(1,083
 )   $
393
     $
(2,193
 )
Less income tax provision (benefit)
    
135
      
(402
 )    
146
      
(814
 )
Net
   $
227
     $
(681
 )   $
247
     $
(1,379
 )
Net change to AOCI
   $
3,247
     $
840
     $
2,619
     $
1,255