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Note 8 - 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   $
12,582
    $
11,296
 
Work-in-process    
6,322
     
6,062
 
Finished goods    
5,156
     
4,677
 
Total   $
24,060
    $
22,035