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Note 5 - Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    December 31,
    2018   2017
Raw materials   $
11,727
    $
6,898
 
Work in process    
2,521
     
1,207
 
Finished goods    
5,328
     
4,758
 
Total Inventory   $
19,576
    $
12,863