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Note 4 - Inventories
3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Inventory Disclosure [Text Block]
4.
Inventories
 
Inventories consist of the following:
 
   
March 31,
201
9
   
December 31,
201
8
 
Raw materials
  $
12,238
    $
12,435
 
Work in process
   
12,547
     
13,602
 
Finished goods
   
6,954
     
7,015
 
    $
31,739
    $
33,052