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Note 8 - Inventory (Tables)
3 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30, 2019
   
March 31, 2019
 
Raw materials
  $
6,604
    $
5,474
 
Work-in-process
   
1,039
     
1,922
 
Finished goods
   
3,193
     
4,405
 
Deferred program costs
   
1,088
     
318
 
Net inventory
  $
11,924
    $
12,119