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Note 9 - Goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Goodwill [Table Text Block]
    December 31,
    2017   2016
         
Balance, beginning   $
7,214
     $
7,482
  
Effect of foreign currency adjustments    
1,004
      
(268
 )
Balance, ending   $
8,218
     $
7,214