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Note 4 - Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
   
December 31,
 
   
2019
   
2018
 
Raw materials
  $
82
    $
79
 
Work in process
   
27
     
39
 
Finished goods
   
9
     
23
 
Total
  $
118
    $
141