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Note 16 - Plant Restructuring (Tables)
 12 Months Ended
Mar. 31, 2019
Notes Tables  
Restructuring and Related Costs [Table Text Block]
     
 
    
Other
      
 
  
   
Severance
    
Cost
      
 
  
   
Payable
    
Payable
    
Total
  
                         
                         
Balance March 31, 2017
   $
37
     $
305
     $
342
  
Charge to expense
    
161
      
164
      
325
  
Cash payments/write offs
    
(198
 )    
(469
 )    
(667
 )
Balance March 31, 2018
    
-
      
-
      
-
  
Charge to expense
    
1,508
      
1
      
1,509
  
Cash payments/write offs
    
(1,283
 )    
-
      
(1,283
 )
Balance March 31, 2019
   $
225
     $
1
     $
226