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Note 6 - Inventory (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30, 2018
   
December 31, 2017
 
Raw materials
  $
8,175
    $
2,754
 
Work in process
   
9,520
     
4,166
 
Finished goods
   
9,502
     
3,188
 
Total inventory
  $
27,197
    $
10,108