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Investments in Tax-Exempt Bonds Arbors of Hickory Ridge Purchase (Details) (USD $)
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Jun. 29, 2010
Available-for-Sale Securities, Asset Ownership     100.00% 99.00%
Payments to Acquire Available-for-sale Securities $ 10,164,815 $ 20,917,500    
Arbors at Hickory Ridge [Member]
       
Available-for-sale Securities, Fair Value Disclosure 10,000,000      
Number of Units in Real Estate Property 348      
Available-for-Sale Securities, Asset Ownership 100.00%      
Payments to Acquire Available-for-sale Securities $ 10,200,000      
Debt Instrument, Interest Rate, Stated Percentage 7.98%      
Available-for-sale Security, Maturity Date at a point in time Apr. 01, 2026