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Note 15 - Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
September 30, 2016
   
December 31, 2015
 
Description
 
Carrying
Value
   
Fair Value
(Level 2)
   
Carrying
Value
   
Fair Value
(Level 2)
 
Investment in Marketable Securities
  $ 4,454,219     $ 4,454,219*     $ 5,001,722     $ 5,001,722  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
           
Fair Value Measurements Using
 
Description
 
Balance
   
(Level 1)
   
(Level 2)
   
(Level 3)
 
Real estate assets
 
$
28,910,000
 
 
$
 
 
$
 
 
$
28,910,000
 
Real Estate, Roll Forward [Table Text Block]
Real estate assets at December 31, 2015
  $ 46,950,000    
Real estate sold during the nine-months ended September 30, 2016
    (18,261,000 )  
Change in value of real estate assets
    221,000  
(a)
Real estate assets at September 30, 2016
  $ 28,910,000