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Note 11 - Supplemental Schedule of Non-cash Investing / Financing Activities (Tables)
 3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
   
2016
    
2015
  
Acquisition of real estate interests by assumption of mortgage debt
   $ -     $ 20,800  
Acquisition of real estate interests through proceeds held in escrow
   $ -     $ 31,738  
Proceeds held in escrow through sale of real estate interests
   $ 20,503     $ 13,855  
Issuance of common stock
   $ 91     $ 486  
Surrender of restricted common stock
   $ (5,908 )   $ (5,172 )
Declaration of dividends paid in succeeding period
   $ 116,631     $ 111,357  
Consolidation of Joint Ventures:
                
Increase in real estate and other assets
   $ -     $ 897,476  
Increase in mortgages payable and other liabilities
   $ -     $ 637,976