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Note 2 - Real Estate (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Property Subject to or Available for Operating Lease [Table Text Block]
   
December 31,
  
   
201
7
    
201
6
  
Land
   $
2,971,020
     $
2,786,255
  
Undeveloped land
    
48,264
      
58,931
  
Buildings and improvements:
                
Buildings
    
6,047,413
      
5,790,681
  
Building improvements
    
1,653,581
      
1,562,439
  
Tenant improvements
    
753,501
      
733,993
  
Fixtures and leasehold improvements
    
45,795
      
47,199
  
Above
-market leases
    
153,484
      
150,207
  
In-
place leases and tenant relationships
    
577,870
      
543,342
  
     
12,250,928
      
11,673,047
  
Accumulated depreciation and amortization
(1)
    
(2,433,053
 )    
(2,278,292
 )
Total
   $
9,817,875
     $
9,394,755
  
Above and Below Market Lease Tenant Relationships Future Amortization Income Expense [Table Text Block]
   
2018
    
2019
    
2020
    
202
1
    
202
2
  
Above
-market and below-market leases amortization, net
   $
13.2
     $
14.0
     $
14.1
     $
14.3
     $
13.4
  
In-place leases and t
enant relationships amortization
  $
(43.7
 )   $
(34.6
 )   $
(26.5
 )   $
(20.7
 )   $
(15.9
 )