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Note 1 - Interim Financial Statements (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
 
Three Months Ended
 
 
 
March 31,
 
 
 
2017
 
 
2016
 
Computation of Basic and Diluted Earnings Per Share:
 
 
 
 
 
 
 
 
Net income available to the Company's common shareholders
    
65,178
      
129,158
 
Earnings attributable to participating securities
    
(531
 )    
(629
 )
Net income available to the Company’s common shareholders for basic earnings per share
    
64,647
     
128,529
 
Distributions on convertible units
    
-
     
13
 
Net income available to the Company’s common shareholders for diluted earnings per share
   $
64,647
    $
128,542
 
                 
Weighted average common shares outstanding – basic
   
423,381
     
412,630
 
Effect of dilutive securities (a):
                
Equity awards
   
765
     
1,453
 
Assumed conversion of convertible units
    
-
     
62
 
Weighted average common shares outstanding – diluted
    
424,146
     
414,145
 
                 
Net income available to the Company's common shareholders:
                
Basic earnings per share
   $
0.15
    $
0.31
 
Diluted earnings per share
   $
0.15
    $
0.31