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Note 8 - Inventory (Tables)
6 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30, 2019
   
March 31, 2019
 
Raw materials
  $
7,421
    $
5,474
 
Work-in-process
   
1,943
     
1,922
 
Finished goods
   
3,981
     
4,405
 
Deferred program costs
   
2,152
     
318
 
Net inventory
  $
15,497
    $
12,119