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Note 24 - Supplemental Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
2017
  
   
First
Quarter
    
Second
Quarter
    
Third
Quarter
    
Fourth
Quarter
  
Revenues from rental properties
   $
289,391
     $
292,843
     $
290,919
     $
310,632
  
Net income attributable to the Company
   $
76,733
     $
143,416
     $
121,030
     $
84,566
  
Net income per common share:
                                
Basic
   $
0.15
     $
0.31
     $
0.24
     $
0.17
  
Diluted
   $
0.15
     $
0.31
     $
0.24
     $
0.17
  
   
2016
  
   
First
Quarter
    
Second
Quarter
    
Third
Quarter
    
Fourth
Quarter
  
Revenues from rental properties
   $
293,091
     $
287,115
     $
279,286
     $
292,909
  
Net income attributable to the Company
   $
140,713
     $
203,409
     $
(43,545
 )   $
78,273
  
Net income per common share:
                                
Basic
   $
0.31
     $
0.46
     $
(0.13
 )   $
0.16
  
Diluted
   $
0.31
     $
0.46
     $
(0.13
 )   $
0.16