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Note 9 - Property, Plant and Equipment (Tables)
 12 Months Ended
Mar. 31, 2021
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
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