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Note 9 - Redeemable Non-controlling Interests (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Redeemable Noncontrolling Interest [Table Text Block]
    2016   2015
         
Balance, January 1   $
77,559
    $
80,926
 
RNCI share of earnings    
5,238
     
4,560
 
RNCI redemption increment    
15,408
     
12,243
 
Distributions paid to RNCI    
(4,985
)    
(3,602
)
Purchases of interests from RNCI, net    
(1,057
)    
(17,817
)
RNCI recognized on business acquisitions    
10,612
     
1,696
 
Other    
(423
)    
(447
)
Balance, December 31   $
102,352
    $
77,559