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Note 7 - Inventory (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
2019
   
2018
 
                 
Raw materials
  $
-
    $
-
 
Work in progress
   
12
     
31
 
Total
  $
12
    $
31