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Note 16 - Plant Restructuring (Tables)
 12 Months Ended
Mar. 31, 2020
Notes Tables  
Restructuring and Related Costs [Table Text Block]
           
Other
          
   
Severance
    
Cost
      
 
  
   
Payable
    
Payable
    
Total
  
                         
                         
Balance March 31, 2018
   $
-
     $
-
     $
-
  
Charge to expense
    
1,508
      
10,149
      
11,657
  
Cash payments/write offs
    
(1,283
 )    
(10,148
 )    
(11,431
 )
Balance March 31, 2019
    
225
      
1
      
226
  
Charge to expense
    
1,229
      
5,817
      
7,046
  
Cash payments/write offs
    
(1,252
 )    
(5,818
 )    
(7,070
 )
Balance March 31, 2020
   $
202
     $
-
     $
202