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Note 9 - Goodwill
 12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Goodwill Disclosure [Text Block]
9.
Goodwill
 
The Company completed its annual impairment review as of
November 30, 2017
and concluded that
no
impairment in the carrying value exists as of that date with respect to goodwill. Through
December 31, 2017,
there have
not
been any events or changes in circumstances that indicate that the carrying value of goodwill
may
not
be recoverable. Changes in the carrying value of goodwill were as follows:
 
    December 31,
    2017   2016
         
Balance, beginning   $
7,214
     $
7,482
  
Effect of foreign currency adjustments    
1,004
      
(268
 )
Balance, ending   $
8,218
     $
7,214