Annual report pursuant to Section 13 and 15(d)

SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Reconciliation of Real Estate (Details)

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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Reconciliation of Real Estate (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investment in real estate:      
Balance, beginning of year $ 538,112,220 $ 541,478,086 $ 543,095,478
Addition: Acquisitions and developments 3,599 9,649 65,371
Deduction: Dispositions and other (52,747,369) (3,375,515) (1,682,763)
Balance, end of year 485,368,450 538,112,220 541,478,086
Accumulated depreciation:      
Balance, beginning of year 72,155,753 52,219,717 33,869,263
Addition: Depreciation 20,986,461 19,936,036 18,350,454
Deduction: Dispositions and other (5,988,119) 0 0
Balance, end of year $ 87,154,095 $ 72,155,753 $ 52,219,717