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Note 10 - Property, Plant and Equipment (Tables)
9 Months Ended
Dec. 31, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31, 2020
   
March 31, 2020
 
Construction in progress - equipment   $
111
    $
3,130
 
Land    
270
     
 
Building    
1,630
     
 
Equipment and software    
41,743
     
41,737
 
Furniture and fixtures    
1,310
     
1,302
 
Leasehold improvements    
6,306
     
2,477
 
Property, plant and equipment, gross    
51,370
     
48,646
 
Less accumulated depreciation    
(41,823
)    
(40,081
)
Property, plant and equipment, net
  $
9,547
    $
8,565