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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
2018
   
2017
 
Finished goods
  $
58,196
    $
54,354
 
Work in process
   
650
     
604
 
Raw materials
   
8,455
     
10,021
 
    $
67,301
    $
64,979