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Note 6 - Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    June 30,
2019
  December 31,
2018
Raw materials   $
10,168
    $
11,727
 
Work in process    
2,837
     
2,521
 
Finished goods    
6,033
     
5,328
 
Total inventory   $
19,038
    $
19,576