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Note 8 - Inventory (Tables)
12 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31, 2021
   
March 31, 2020
 
Raw materials
  $
8,255
    $
10,739
 
Work-in-process
   
3,297
     
1,345
 
Finished goods
   
777
     
5,260
 
Deferred program costs
   
977
     
1,631
 
Inventory
  $
13,306
    $
18,975