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Note 6 - Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    June 30,
2018
  December 31,
2017
Raw materials   $
9,193
    $
6,898
 
Work in process    
3,710
     
1,207
 
Finished goods    
5,829
     
4,758
 
Total inventory   $
18,732
    $
12,863