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Note 13 - Redeemable Non-controlling Interests (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Redeemable Noncontrolling Interest [Table Text Block]
    2020   2019
         
Balance, January 1   $
174,662
    $
151,585
 
RNCI share of earnings    
6,354
     
7,874
 
RNCI redemption increment    
15,977
     
16,105
 
Distributions paid to RNCI    
(5,084
)    
(5,725
)
Purchases of interests from RNCI, net    
(20,231
)    
(30,648
)
RNCI recognized on business acquisitions    
21,293
     
35,307
 
Other    
63
     
164
 
Balance, December 31   $
193,034
    $
174,662