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Note 24 - Supplemental Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Quarterly Financial Information [Table Text Block]
     
2018
  
     
First
Quarter
    
Second
Quarter
    
Third
Quarter
    
Fourth
Quarter
  
Revenues
   $
304,078
     $
293,403
     $
283,080
     $
284,201
  
Net income attributable to the Company
   $
144,090
     $
165,386
     $
100,158
     $
88,161
  
Net income per common share:
                                
Basic
   $
0.30
     $
0.36
     $
0.19
     $
0.17
  
Diluted
   $
0.30
     $
0.36
     $
0.19
     $
0.17
  
     
2017
  
     
First
Quarter
    
Second
Quarter
    
Third
Quarter
    
Fourth
Quarter
  
Revenues
   $
293,588
     $
297,176
     $
294,845
     $
315,225
  
Net income attributable to the Company
   $
76,733
     $
143,416
     $
121,030
     $
84,896
  
Net income per common share:
                                
Basic
   $
0.15
     $
0.31
     $
0.24
     $
0.17
  
Diluted
   $
0.15
     $
0.31
     $
0.24
     $
0.17