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Note 8 - Inventory (Tables)
9 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31, 2019
   
March 31, 2019
 
Raw materials
  $
11,456
    $
5,474
 
Work-in-process
   
2,072
     
1,922
 
Finished goods
   
3,967
     
4,405
 
Deferred program costs
   
1,096
     
318
 
Net inventory
  $
18,591
    $
12,119