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Note 4 - Redeemable Noncontrolling Interest (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Redeemable Noncontrolling Interest [Table Text Block]
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2018
    
2017
    
2018
    
2017
  
Balance at beginning of period
   $
54,404
     $
33,566
     $
43,929
     $
33,138
  
Net income
    
848
      
92
      
822
      
210
  
Foreign currency translation
    
(4,522
 )    
4,433
      
(1,686
 )    
5,357
  
Redemption value adjustment
    
2,305
      
(295
 )    
9,970
      
(909
 )
Balance at end of period
   $
53,035
     $
37,796
     $
53,035
     $
37,796