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Schedule III - Real Estate and Accumulated Depreciation (Details 2) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]      
Balance at January 1 $ 59,089,851 $ 65,436,739 $ 58,856,688
Current year depreciation expense 11,464,695 8,361,698 6,930,145
Disposition of real estate (14,153,123) (14,708,586) (350,094)
Balance at December 31 $ 56,401,423 $ 59,089,851 $ 65,436,739