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Note 12 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2014
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   

September 30, 2014

   

December 31, 2013

 
   

Carrying

Amounts

   

Estimated

Fair Value

   

Carrying

Amounts

   

Estimated

Fair Value

 

Marketable securities (1)

  $ 77,123     $ 77,253     $ 62,766     $ 62,824  
                                 

Notes payable (2)

  $ 3,353,458     $ 3,513,711     $ 3,186,047     $ 3,333,614  
                                 

Mortgages payable (3)

  $ 1,343,859     $ 1,399,124     $ 1,035,354     $ 1,083,801  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   

Balance at

September 30, 2014

   

Level 1

   

Level 2

   

Level 3

 
                                 

Marketable equity securities

  $ 74,547     $ 74,547     $ -     $ -  
   

Balance at

December 31, 2013

   

Level 1

   

Level 2

   

Level 3

 
                                 

Marketable equity securities

  $ 59,723     $ 59,723     $ -     $ -  
   

Balance at

September 30, 2014

   

Level 1

   

Level 2

   

Level 3

 
                                 

Real estate

  $ 228,798     $ -     $ -     $ 228,798  
   

Balance at

December 31, 2013

   

Level 1

   

Level 2

   

Level 3

 
                                 

Real estate

  $ 217,529     $ -     $ -     $ 217,529  

Joint venture investments

  $ 59,693     $ -     $ -     $ 59,693  

Other real estate investments

  $ 2,050     $ -     $ -     $ 2,050  

Cost method investment

  $ 4,670     $ -     $ -     $ 4,670