Annual report pursuant to Section 13 and 15(d)

Prepaid Expenses and Other Assets (Details 2)

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Prepaid Expenses and Other Assets (Details 2) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Mortgage and other investing receivables    
Mortgage and other investing receivables $ 33,396,000 $ 27,998,000
Fair value of mortgage and other investing receivables 33,400,000 28,000,000
Notes receivable from City of Huntsville
   
Mortgage and other investing receivables    
Mortgage and other investing receivables 33,252,000 17,741,000
Mortgage loans receivable
   
Mortgage and other investing receivables    
Mortgage and other investing receivables 144,000 10,257,000
Number of mortgage loans receivable 1  
Operating notes receivable
   
Operating Notes Receivable    
Operating notes receivables due from tenants with terms exceeding one year $ 271,000 $ 530,000