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Schedule III (Real Estate and Accumulated Depreciation and Amortization Changes in Period) (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Real estate        
Balance at the beginning of the year   $ 261,047,651 $ 261,047,651 $ 224,730,052
Acquisitions     23,667,535 68,482,972
Improvements     4,150,213 2,854,939
Impairment of real estate assets $ (700,000) (700,000) (948,053) 0
Dispositions of real estate     (11,083,652) (35,020,312)
Balance at the end of the year     276,833,694 261,047,651
Accumulated depreciation and amortization        
Balance at the beginning of the year   $ (29,961,472) (29,961,472) (26,540,852)
Depreciation and amortization expense     (10,256,185) (7,784,917)
Dispositions of real estate     3,906,172 4,364,297
Balance at the end of the year     $ (36,311,485) [1] $ (29,961,472)
[1] Depreciation is computed on a straight-line basis using useful lives up to 39 years.