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Note 6 - Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
201
8
   
2017
 
Raw materials
  $
12,435
    $
12,267
 
Work in process
   
13,602
     
13,800
 
Finished goods
   
7,015
     
5,654
 
    $
33,052
    $
31,721