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Note 2 - Real Estate (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Property Subject to or Available for Operating Lease [Table Text Block]
 
 
December 31,
 
 
 
201
6
 
 
201
5
 
Land
   $
2,786,255
     $
2,660,722
  
Undeveloped land
    
58,931
      
67,535
  
Buildings and improvements:
                
Buildings
    
5,790,681
      
5,643,629
  
Building improvements
    
1,562,439
      
1,559,652
  
Tenant improvements
    
733,993
      
727,036
  
Fixtures and leasehold improvements
    
47,199
      
47,055
  
Above-market leases
    
150,207
      
155,451
  
In-place leases and tenant relationships
    
543,342
      
528,539
  
     
11,673,047
      
11,389,619
  
Accumulated depreciation and amortization (1)
    
(2,278,292
 )    
(2,115,320
 )
Total
   $
9,394,755
     $
9,274,299
  
Above and Below Market Lease Tenant Relationships Future Amortization Income Expense [Table Text Block]
 
 
2017
 
 
2018
 
 
2019
 
 
2020
 
 
202
1
 
Above-market and below-market leases amortization, net
   $
10.7
     $
10.8
     $
11.3
     $
11.5
     $
11.5
  
In-place leases and tenant relationships amortization
  $
(46.5
 )   $
(34.1
 )   $
(26.3
 )   $
(19.3
 )   $
(15.4
 )