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Note 9 - Inventory (Tables)
9 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31, 2020
   
March 31, 2020
 
Raw materials   $
7,651
    $
10,739
 
Work-in-process    
3,497
     
1,345
 
Finished goods    
1,698
     
5,260
 
Deferred program costs    
1,330
     
1,631
 
Net inventory
  $
14,176
    $
18,975