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Properties Held for Sale (Details) (USD $)
12 Months Ended
Dec. 31, 2012
property
Dec. 31, 2011
property
Dec. 31, 2010
property
Properties Held for Sale      
Number of properties obtained in settlement of accounts receivable 6 5 13
Properties held for sale obtained in settlement of accounts receivable $ 970,625 $ 1,479,405 $ 2,091,056
Gain (loss) from sale of properties held for sale 45,936 417,610 1,348,003
Carrying amount of properties held for sale 611,892 1,287,157  
Properties held for sale transferred to property and equipment $ 1,281,008 $ 2,546,721   
Residential properties
     
Properties Held for Sale      
Number of properties held for sale 2 3  
Commercial properties
     
Properties Held for Sale      
Number of properties held for sale   2