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Note 12 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
June 30
,
2018
   
December 31,
2017
 
   
Carrying
Amounts
   
Estimated
Fair Value
   
Carrying
Amounts
   
Estimated
Fair Value
 
Notes payable, net (1)
  $
4,591,178
    $
4,338,371
    $
4,596,140
    $
4,601,479
 
Mortgages payable, net (2)
  $
477,538
    $
470,651
    $
882,787
    $
881,427
 
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   
Balance at
June 30
,
2018
   
Level 1
   
Level 2
   
Level 3
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
  $
11,838
    $
11,838
    $
 
    $
-
 
Interest rate swaps
  $
72
    $
 
    $
72
    $
-
 
   
Balance at
December 31,
2017
   
Level 1
   
Level 2
   
Level 3
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
  $
11,936
    $
11,936
    $
-
    $
-
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate swaps
  $
344
    $
-
    $
344
    $
-
 
   
Balance at
June 30
,
2018
   
Level 1
   
Level 2
   
Level 3
 
                                 
Real estate
  $
117,070
    $
-
    $
-
    $
117,070
 
Investments in real estate joint ventures (1)
  $
62,429
    $
-
    $
-
    $
62,429
 
   
Balance at
December 31,
2017
   
Level 1
   
Level 2
   
Level 3
 
                                 
Real estate
  $
108,313
    $
-
    $
-
    $
108,313