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Note 6 - Property, Plant and Equipment
 12 Months Ended
Mar. 31, 2020
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]
Note
6
.
Property, Plant and Equipment
 
Property, plant and equipment were as follows:
 
   
March 31, 2020
    
March 31, 2019
  
Land
   $
889
     $
889
  
Buildings
    
18,880
      
18,648
  
Manufacturing equipment
    
9,851
      
8,732
  
Computer equipment
    
3,601
      
3,698
  
Construction in progress
    
242
      
107
  
Other
    
1,344
      
1,393
  
Gross total
    
34,807
      
33,467
  
Accumulated depreciation
    
(12,741
 )    
(11,242
 )
Property, plant, and equipment, net
   $
22,066
     $
22,225
  
 
Depreciation expense for the years ended
March 31, 2020
, 
2019
and
2018
was
$2,234,
$2,338,
and
$2,542
 respectively.