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Note 5 - Inventories (Tables)
12 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31, 2020
   
March 31, 2019
 
Raw materials
  $
6,757
    $
6,804
 
Work-in-process
   
329
     
428
 
Finished goods
   
9,768
     
2,524
 
Less: reserve
   
(2,624
)    
(2,984
)
Inventories, net
  $
14,230
    $
6,772