Loans Payable - Schedule of Loans Payable (Detail) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Less: Deferred financing costs, net of accumulated amortization	$ (3,685,465)	$ (3,798,470)
Loans payable, net of deferred financing costs and amortization	375,201,719	356,088,714
Valencia Property [Member]
Debt Instrument [Line Items]
Principal amount of loans	55,200,000	55,200,000
Less: Deferred financing costs, net of accumulated amortization	(827,743)	(849,750)
Loans payable, net of deferred financing costs and amortization	54,372,257	54,350,250
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal amount of loans	47,850,000	28,850,000
Less: Deferred financing costs, net of accumulated amortization	(889,190)	(927,108)
Loans payable, net of deferred financing costs and amortization	46,960,810	27,922,892
Kacey Property [Member]
Debt Instrument [Line Items]
Principal amount of loans	40,640,000	40,640,000
Less: Deferred financing costs, net of accumulated amortization	(365,350)	(374,663)
Loans payable, net of deferred financing costs and amortization	40,274,650	40,265,337
Industry Property [Member]
Debt Instrument [Line Items]
Principal amount of loans	43,200,000	43,200,000
Less: Deferred financing costs, net of accumulated amortization	(439,006)	(450,099)
Loans payable, net of deferred financing costs and amortization	42,760,994	42,749,901
UBS AG, CCRE, Citigroup Global Markets Realty Corp, Goldman Sachs Bank USA, CBRE Multifamily Capital Inc and Arbor Private Label LLC [Member]
Debt Instrument [Line Items]
Principal amount of loans	378,887,184	359,887,184
Less: Deferred financing costs, net of accumulated amortization	(3,685,465)	(3,798,470)
Loans payable, net of deferred financing costs and amortization	375,201,719	356,088,714
UBS AG [Member] | GR Property [Member]
Debt Instrument [Line Items]
Principal amount of loans	4,500,000	4,500,000
Less: Deferred financing costs, net of accumulated amortization	(43,241)	(45,290)
Loans payable, net of deferred financing costs and amortization	4,456,759	4,454,710
UBS AG [Member] | FM Property [Member]
Debt Instrument [Line Items]
Principal amount of loans	21,000,000	21,000,000
Less: Deferred financing costs, net of accumulated amortization	(125,206)	(129,773)
Loans payable, net of deferred financing costs and amortization	20,874,794	20,870,227
CCRE [Member] | CO Property [Member]
Debt Instrument [Line Items]
Principal amount of loans	26,550,000	26,550,000
Less: Deferred financing costs, net of accumulated amortization	(182,047)	(186,338)
Loans payable, net of deferred financing costs and amortization	26,367,953	26,363,662
Goldman Sachs Bank USA [Member] | Buchanan Property [Member]
Debt Instrument [Line Items]
Principal amount of loans	9,600,000	9,600,000
Less: Deferred financing costs, net of accumulated amortization	(72,772)	(74,520)
Loans payable, net of deferred financing costs and amortization	9,527,228	9,525,480
Arbor Private Label, LLC [Member] | Summerfield Property [Member]
Debt Instrument [Line Items]
Principal amount of loans	76,575,000	76,575,000
Less: Deferred financing costs, net of accumulated amortization	(197,676)	(203,088)
Loans payable, net of deferred financing costs and amortization	76,377,324	76,371,912
Citigroup Global Markets Realty Corp [Member] | DST Properties [Member]
Debt Instrument [Line Items]
Principal amount of loans	22,495,184	22,495,184
Less: Deferred financing costs, net of accumulated amortization	(245,708)	(252,090)
Loans payable, net of deferred financing costs and amortization	22,249,476	22,243,094
CBRE Multifamily Capital, Inc. [Member] | Keller Springs Property [Member]
Debt Instrument [Line Items]
Principal amount of loans	31,277,000	31,277,000
Less: Deferred financing costs, net of accumulated amortization	(297,526)	(305,751)
Loans payable, net of deferred financing costs and amortization	$ 30,979,474	$ 30,971,249