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Note 9 - Property, Plant and Equipment (Tables)
3 Months Ended
Jun. 30, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
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