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Note 11 - Redeemable Non-controlling Interests (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Redeemable Noncontrolling Interest [Table Text Block]
          2017  
    2018     (note 23)  
             
Balance, January 1   $
145,489
     $
134,803
  
RNCI share of earnings    
20,491
      
16,687
  
RNCI redemption increment    
7,709
      
22,393
  
Distributions paid to RNCI    
(16,396
 )    
(12,870
 )
Purchases of interests from RNCI, net    
1,111
      
(31,782
 )
RNCI recognized on business acquisitions    
184,957
      
16,258
  
Balance, December 31   $
343,361
     $
145,489