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Note 5 - Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
201
8
   
2017
 
                 
Work-in-progress
  $
4,993
    $
3,577
 
Finished products
   
4,826
     
5,845
 
                 
    $
9,819
    $
9,422