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Note 9 - Property, Plant and Equipment
 3 Months Ended
Jun. 30, 2020
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]
9.
Property, Plant and Equipment
 
The cost and accumulated depreciation of property, plant and equipment at 
June 30, 2020
and 
March 31, 2020
are as follows (in thousands):
 
   
June 30, 2020
    
March 31, 2020
  
Construction in progress - equipment
   $
3,739
     $
3,130
  
Equipment and software
    
41,798
      
41,737
  
Furniture and fixtures
    
1,317
      
1,302
  
Leasehold improvements
    
2,480
      
2,477
  
Property, plant and equipment, gross
    
49,334
      
48,646
  
Less accumulated depreciation
    
(41,003
 )    
(40,081
 )
Property, plant and equipment, net
   $
8,331
     $
8,565
  
 
Depreciation expense was $
0.9
million and
$1.1
 million for the
three
months ended
June 30, 2020
and
2019
, 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.