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Note 3 - Redeemable Noncontrolling Interest (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Redeemable Noncontrolling Interest [Table Text Block]
   
Three Months Ended March 31,
 
   
2018
   
2017
 
Balance at beginning of period
  $
43,929
    $
33,138
 
Net income
   
(26
)    
118
 
Foreign currency translation
   
2,836
     
924
 
Redemption value adjustment
   
7,665
     
(614
)
Balance at end of period
  $
54,404
    $
33,566