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Note 5 - Inventory (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
2019
   
December 31,
2018
 
                 
Raw materials
  $
-
    $
-
 
Work in progress
   
63
     
31
 
Total
  $
63
    $
31