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Note 12 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
March 31, 2019
   
December 31,
2018
 
   
Carrying
Value
   
Fair Value
   
Carrying
Value
   
Fair Value
 
Notes payable, net (1)
  $
4,383,413
    $
4,302,177
    $
4,381,456
    $
4,126,450
 
Mortgages and construction loan payable, net (2)
  $
485,341
    $
483,412
    $
492,416
    $
486,341
 
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   
Balance at
March 31, 2019
   
Level 1
   
Level 2
   
Level 3
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
  $
10,705
    $
10,705
    $       $
-
 
   
Balance at
December 31,
2018
   
Level 1
   
Level 2
   
Level 3
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
  $
9,045
    $
9,045
    $
-
    $
-
 
   
Balance at
March 31, 2019
   
Level 1
   
Level 2
   
Level 3
 
                                 
Real estate
  $
13,700
    $
-
    $
-
    $
13,700
 
   
Balance at
December 31,
2018
   
Level 1
   
Level 2
   
Level 3
 
                                 
Real estate
  $
99,693
    $
-
    $
-
    $
99,693
 
Investments in real estate joint ventures (1)
  $
62,429
    $
-
    $
-
    $
62,429