Five Year Minimum Rental Payments - Schedule of Estimated Future Minimum Rents (Detail)	Jun. 30, 2020 USD ($)
Operating Leased Assets [Line Items]
2020 (remaining)	$ 5,454,751
2021	11,023,706
2022	10,619,182
2023	10,774,607
2024	10,866,018
Thereafter	70,697,136
Total	119,435,400
GR Property [Member]
Operating Leased Assets [Line Items]
2020 (remaining)	250,000
2021	500,000
2022	500,000
2023	500,000
2024	500,000
Thereafter	4,250,000
Total	6,500,000
FM Property [Member]
Operating Leased Assets [Line Items]
2020 (remaining)	1,254,620
2021	2,560,296
2022	2,611,352
2023	2,663,909
2024	2,716,467
Thereafter	11,419,972
Total	23,226,616
CO Property [Member]
Operating Leased Assets [Line Items]
2020 (remaining)	1,597,060
2021	3,216,864
2022	3,251,284
2023	3,286,073
2024	3,321,234
Thereafter	26,929,125
Total	41,601,640
Lewisville Property [Member]
Operating Leased Assets [Line Items]
2020 (remaining)	444,627
2021	915,933
2022	915,933
2023	943,411
2024	943,411
Thereafter	3,415,571
Total	7,578,886
DST Properties [Member]
Operating Leased Assets [Line Items]
2020 (remaining)	1,097,979
2021	2,209,683
2022	2,305,756
2023	2,305,756
2024	2,305,756
Thereafter	16,664,853
Total	26,889,783
SF Property [Member]
Operating Leased Assets [Line Items]
2020 (remaining)	293,036
2021	586,073
Total	879,109
Buchanan Property [Member]
Operating Leased Assets [Line Items]
2020 (remaining)	517,429
2021	1,034,857
2022	1,034,857
2023	1,075,458
2024	1,079,150
Thereafter	8,017,615
Total	$ 12,759,366