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Note 14 - Noncontrolling Interests (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Redeemable Noncontrolling Interest [Table Text Block]
   
2017
    
2016
  
Balance at January 1,
   $
86,953
     $
86,709
  
Issuance of redeemable partnership interests (1)
    
10,000
      
-
  
Income (2)
    
1,297
      
4,349
  
Redemption/conversion of redeemable units (3)
    
(79,569
 )    
-
  
Distributions
    
(2,538
 )    
(4,105
 )
Balance at December 31,
  
$
16,143
    
$
86,953
  
Convertible Non-convertible Units [Table Text Block]
Type
  
Par Value
Per Unit
    
Number of Units Remaining
    
Return Per Annum
  
Class B-1 Preferred Units (1)
   $
10,000
      
189
    
7.0%
  
Class B-2 Preferred Units (2)
   $
10,000
      
42
    
7.0%
  
Class C DownReit Units (1)
   $
30.52
      
52,797
    
Equal to the Company
’s common stock dividend