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Note 10 - Goodwill (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Goodwill [Table Text Block]
    June 30,
2018
Balance at January 1, 2018   $
8,218
  
Effect of foreign currency adjustments    
(205
 )
Balance at June 30, 2018   $
8,013