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Note 7 - Plant Restructuring (Tables)
 9 Months Ended
Dec. 30, 2017
Notes Tables  
Restructuring and Related Costs [Table Text Block]
           
Long-Live
d
                  
   
Severanc
e
    
Asset Charge
s
    
Other Cost
s
    
Tota
l
  
   
(In thousands
)
  
                                 
Balance March 31, 201
7
   $
37
     $
4,773
     $
305
     $
5,115
  
First quarter charg
e
    
36
      
9
      
36
      
81
  
Second quarter charge (credit
)
    
-
      
8
      
(33
 )    
(25
 )
Third quarter charge (credit
)
    
98
      
-
      
3
      
101
  
Cash payments/write off
s
    
(73
 )    
(3,888
 )    
(311
 )    
(4,272
 )
Balance December 30, 201
7
   $
98
     $
902
     $
-
     $
1,000
  
                                 
                                 
Balance March 31, 201
6
   $
-
     $
4,975
     $
3,897
     $
8,872
  
First quarter charge (credit
)
    
127
      
(6
 )    
1,064
      
1,185
  
Second quarter charge (credit
)
    
112
      
(286
 )    
451
      
277
  
Third quarter charge (credit
)
    
1,261
      
62
      
(7
 )    
1,316
  
Cash payments/write off
s
    
(1,480
 )    
164
      
(3,588
 )    
(4,904
 )
Balance December 31, 201
6
   $
20
     $
4,909
     $
1,817
     $
6,746