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Note 6 - Inventory (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September
30, 2018
   
December 31, 2017
 
Raw materials
  $
9,437
    $
2,754
 
Work in process
   
13,203
     
4,166
 
Finished goods
   
8,772
     
3,188
 
Total inventory
  $
31,412
    $
10,108