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Note 5 - Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
2018
   
2017
 
Raw materials
  $
79
    $
70
 
Work in process
   
39
     
92
 
Finished goods
   
23
     
29
 
Total
  $
141
    $
191