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Note 6 - Inventory (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
2018
   
2017
 
                 
Raw materials
  $
-
    $
367
 
Work in progress
   
31
     
24
 
Total
   
31
     
391