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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
2019
   
2018
 
Finished goods
  $
65,413
    $
61,098
 
Work in process
   
652
     
650
 
Raw materials
   
7,314
     
8,455
 
Inventories   $
73,379
    $
70,203