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Note 9 - Plant Restructuring (Tables)
 9 Months Ended
Dec. 29, 2018
Notes Tables  
Restructuring and Related Costs [Table Text Block]
   
Restructuring Payable
  
   
Severance
    
Other Costs
    
Total
  
   
(In thousands)
  
                         
Balance March 31, 2018
   $
-
     $
-
     $
-
  
First quarter charge
    
110
      
-
      
110
  
Second quarter charge
    
841
      
-
      
841
  
Third quarter charge
    
378
      
-
      
378
  
Cash payments/write offs
    
(976
 )    
-
      
(976
 )
Balance December 29, 2018
   $
353
     $
-
     $
353
  
   
Severance
    
Other Costs
    
Total
  
   
(In thousands)
  
                         
Balance March 31, 2017
   $
37
     $
305
     $
342
  
First quarter charge
    
36
      
36
      
72
  
Second quarter credit
    
-
      
(33
 )    
(33
 )
Third quarter charge
    
98
      
3
      
101
  
Cash payments/write offs
    
(73
 )    
(311
 )    
(384
 )
Balance December 30, 2017
   $
98
     $
-
     $
98