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Note 10 - Goodwill (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Goodwill [Table Text Block]
    June 30,
2019
Balance at January 1, 2019   $
7,851
  
Effect of foreign currency adjustments    
(53
 )
Balance at June 30, 2019   $
7,798