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Note 9 - Plant Restructuring (Tables)
 9 Months Ended
Dec. 28, 2019
Notes Tables  
Restructuring and Related Costs [Table Text Block]
    Restructuring Payable  
   
Severance
    
Other Costs
    
Total
  
   
(In thousands)
  
                         
Balance March 31, 2019
   $
225
     $
1
     $
226
  
First quarter charge
    
586
      
4,220
      
4,806
  
Second quarter charge
    
386
      
760
      
1,146
  
Third quarter charge
    
28
      
765
      
793
  
Cash payments/write offs
    
(1,145
 )    
(5,746
 )    
(6,891
 )
Balance December 28, 2019
   $
80
     $
-
     $
80
  
   
Severance
    
Other Costs
    
Total
  
   
(In thousands)
  
                         
Balance March 31, 2018
   $
-
     $
-
     $
-
  
First quarter charge
    
110
      
(72
 )    
38
  
Second quarter charge
    
845
      
-
      
845
  
Third quarter charge
    
378
      
1,018
      
1,396
  
Cash payments/write offs
    
(976
 )    
72
      
(904
 )
Balance December 29, 2018
   $
357
     $
1,018
     $
1,375