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Note 4 - Redeemable Noncontrolling Interest (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Redeemable Noncontrolling Interest [Table Text Block]
   
Three Months Ended September 30,
    
Nine Months Ended September 30,
    
   
2018
    
2017
    
2018
    
2017
    
Balance at beginning of period
   $
53,035
  
 
 $
37,796
  
 
 $
43,929
  
 
 $
33,138
  
 
Noncontrolling interest of Pramac
    
-
  
 
  
1,540
  
(1)
  
-
  
 
  
1,540
  
(1)
Net income
    
519
  
 
  
283
  
 
  
1,341
  
 
  
493
  
 
Foreign currency translation
    
(569
 )
 
  
2,178
  
 
  
(2,255
 )
 
  
7,535
  
 
Redemption value adjustment
    
6,912
  
(2)
  
-
  
 
  
16,882
  
(2) 
  
(909
 )
 
Balance at end of period
   $
59,897
  
 
 $
41,797
  
 
 $
59,897
  
 
 $
41,797