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Note 3 - Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
As of December 31,
 
   
2019
   
2018
 
Raw materials
  $
1,153
    $
694
 
Work-in-process
   
593
     
160
 
Finished goods
   
1,549
     
 
Inventories
  $
3,295
    $
854