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Note 15 - Fair Value Disclosure of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
December 31,
 
   
201
7
   
201
6
 
   
Carrying
Amounts
   
Estimated
Fair Value
   
Carrying
Amounts
   
Estimated
Fair Value
 
Notes
payable (1)
  $
4,596,140
    $
4,601,479
    $
3,927,251
    $
3,890,797
 
Mortgages
payable (2)
  $
882,787
    $
881,427
    $
1,139,117
    $
1,141,047
 
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   
Balance at
December 31,
201
7
   
Level 1
   
Level 2
   
Level 3
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
  $
11,936
    $
11,936
    $
-
    $
-
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate swaps
  $
344
    $
-
    $
344
    $
-
 
   
Balance at
December 31,
201
6
   
Level 1
   
Level 2
   
Level 3
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
  $
6,502
    $
6,502
    $
-
    $
-
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate swaps
  $
975
    $
-
    $
975
    $
-
 
   
Balance at
December 31,
201
7
   
Level 1
   
Level 2
   
Level 3
 
                                 
Real estate
  $
108,313
    $
-
    $
-
    $
108,313
 
   
Balance at
December 31, 201
6
   
Level 1
   
Level 2
   
Level 3
 
                                 
Real estate
  $
117,930
    $
-
    $
-
    $
117,930