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Note 9 - Property, Plant and Equipment
 12 Months Ended
Mar. 31, 2021
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]
9.
 Property, Plant and Equipment
 
The cost and accumulated depreciation of property and equipment at 
March 31, 2021
and 
2020
are as follows (in thousands):
 
   
March 31, 2021
    
March 31, 2020
  
Land   $
270
     $
—
  
Construction in progress - equipment    
220
      
3,130
  
Buildings    
1,630
      
—
  
Equipment and software    
41,652
      
41,737
  
Furniture and fixtures    
1,333
      
1,302
  
Leasehold improvements    
6,308
      
2,477
  
Property, plant and equipment, gross    
51,413
      
48,646
  
Less accumulated depreciation    
(42,416
 )    
(40,081
 )
Property, plant and equipment, net   $
8,997
     $
8,565
  
 
Depreciation expense was $
3.7
 million and
$4.0
million, for the fiscal years ended 
March 31, 2021
and
2020
, respectively.  Construction in progress - equipment primarily includes capital investments in the Company's HTS equipment and leasehold improvements in the Company's leased facility in Ayer, Massachusetts.  The increase in land and building relates to the property added as part of the NEPSI Acquisition.