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Note 8 - Retirement Plans (Tables)
 6 Months Ended
Sep. 28, 2019
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
Three Months Ended
     Six Months Ended   
   
September 28,
2019
    
September 29,
2018
    
September 28,
2019
    
September 29,
2018
  
   
(In thousands)
  
Service Cost
   $
2,288
     $
2,442
     $
4,572
     $
4,885
  
Interest Cost
    
2,296
      
2,243
      
4,593
      
4,486
  
Expected Return on Plan Assets
    
(3,958
 )    
(3,596
 )    
(7,913
 )    
(7,192
 )
Amortization of Prior Service Cost
    
30
      
30
      
60
      
60
  
Amortization of Net Loss
    
-
      
303
      
-
      
605
  
Net Periodic Benefit Cost
   $
656
     $
1,422
     $
1,312
     $
2,844