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Note 6 - Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
201
9
   
2018
 
                 
Work-in-progress
  $
4,512
    $
4,993
 
Finished products
   
2,952
     
4,826
 
                 
    $
7,464
    $
9,819