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Schedule III (Real Estate and Accumulated Depreciation and Amortization Changes in Period) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Real estate    
Balance at the beginning of the year $ 274,546,199 $ 276,833,694
Acquisitions 17,326,915 17,560,745
Improvements 3,359,283 3,616,140
Impairment of real estate assets (532,951)  
Dispositions of real estate (40,023,572) (23,464,380)
Balance at the end of the year 254,675,874 274,546,199
Accumulated depreciation and amortization    
Balance at the beginning of the year (40,012,255) (36,311,485)
Depreciation and amortization expense (8,452,012) (9,186,190)
Dispositions of real estate 4,896,458 5,485,420
Balance at the end of the year $ (43,567,809) [1] $ (40,012,255)
[1] Depreciation is computed on a straight-line basis using useful lives up to 39 years.