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Note 6 - Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    March 31,
2019
  December
31, 2018
Raw materials   $
10,432
    $
11,727
 
Work in process    
2,618
     
2,521
 
Finished goods    
6,387
     
5,328
 
Total inventory   $
19,437
    $
19,576