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Note 5 - Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
201
7
   
2016
 
                 
Work-in-progress
  $
3,577
    $
5,784
 
Finished products
   
5,845
     
3,964
 
                 
    $
9,422
    $
9,748