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Note 6 - Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    September 30,
2018
  December 31,
2017
Raw materials   $
10,226
    $
6,898
 
Work in process    
4,105
     
1,207
 
Finished goods    
5,571
     
4,758
 
Total inventory   $
19,902
    $
12,863