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Note 17 - Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
  
   
March 31,
  
   
2018
    
2017
  
Computation of Basic and Diluted Earnings Per Share:
  
 
 
 
  
 
 
 
Net income available to the Company's common shareholders
   $
129,501
     $
65,178
  
Earnings attributable to participating securities
    
(599
 )    
(531
 )
Net income available to the Company’s common shareholders for basic earnings per share
    
128,902
      
64,647
  
Distributions on convertible units
    
244
      
-
  
Net income available to the Company’s common shareholders for diluted earnings per share
   $
129,146
     $
64,647
  
                 
Weighted average common shares outstanding – basic
    
423,404
      
423,381
  
Effect of dilutive securities (1):
                
Equity awards
    
287
      
765
  
Assumed conversion of convertible units
    
830
      
-
  
Weighted average common shares outstanding – diluted
    
424,521
      
424,146
  
                 
Net income available to the Company's common shareholders:
                
Basic earnings per share
   $
0.30
     $
0.15
  
Diluted earnings per share
   $
0.30
     $
0.15