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Note 8 - Retirement Plans (Tables)
 3 Months Ended
Jun. 29, 2019
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
Three Months Ended
  
   
June 29, 2019
    
June 30, 2018
  
   
(In thousands)
  
Service Cost
   $
2,288
     $
2,442
  
Interest Cost
    
2,296
      
2,243
  
Expected Return on Plan Assets
    
(3,958
 )    
(3,596
 )
Amortization of Prior Service Cost
    
30
      
30
  
Amortization of Net Loss
    
-
      
303
  
Net Periodic Benefit Cost
   $
656
     $
1,422