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Note 7 - Plant Restructuring (Tables)
 6 Months Ended
Sep. 30, 2017
Notes Tables  
Restructuring and Related Costs [Table Text Block]
           
Long-Lived
                  
   
Severance
    
Asset Charges
    
Other Costs
    
Total
  
   
(In thousands)
  
                                 
Balance March 31, 2017
   $
37
     $
4,773
     $
305
     $
5,115
  
First quarter charge
    
36
      
9
      
36
      
81
  
Second quarter charge (credit)
    
-
      
8
      
(33
 )    
(25
 )
Cash payments/write offs
    
(73
 )    
(3,888
 )    
(308
 )    
(4,269
 )
Balance September 30, 2017
   $
-
     $
902
     $
-
     $
902
  
                                 
                                 
Balance March 31, 2016
   $
-
     $
4,975
     $
3,897
     $
8,872
  
First quarter charge (credit)
    
127
      
(6
 )    
1,064
      
1,185
  
Second quarter charge (credit)
    
112
      
(286
 )    
451
      
277
  
Cash payments/write offs
    
(123
 )    
240
      
(3,242
 )    
(3,125
 )
Balance October 1, 2016
   $
116
     $
4,923
     $
2,170
     $
7,209