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Note 9 - Property, Plant and Equipment (Tables)
 6 Months Ended
Sep. 30, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
September 30, 2020
    
March 31, 2020
  
Construction in progress - equipment   $
718
     $
3,130
  
Equipment and software    
42,015
      
41,737
  
Furniture and fixtures    
1,326
      
1,302
  
Leasehold improvements    
6,114
      
2,477
  
Property, plant and equipment, gross    
50,173
      
48,646
  
Less accumulated depreciation    
(42,033
 )    
(40,081
 )
Property, plant and equipment, net
   $
8,140
     $
8,565