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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
2019
   
2018
 
Raw materials
  $
    $
79
 
Work in process
   
     
39
 
Finished goods
   
4
     
23
 
Total
 
$
4
   
$
141