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Note 11 - Noncontrolling Interests (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Redeemable Noncontrolling Interest [Table Text Block]
   
2018
    
2017
  
Balance at January 1,
   $
16,143
     $
86,953
  
Issuance of redeemable partnership interests (1)
    
-
      
10,000
  
Income
    
279
      
1,203
  
Distributions
    
(266
 )    
(2,448
 )
Redemption/conversion of redeemable units (2)
    
-
      
(79,569
 )
Adjustment to estimated redemption value (1)
    
3,918
      
-
  
Balance at September 30,
  
$
20,074
    
$
16,139