Investments in Unconsolidated Entities - Additional Information (Details) - USD ($)	1 Months Ended			3 Months Ended			6 Months Ended
	May 31, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2021	Apr. 30, 2021	Jan. 31, 2020
Schedule Of Equity Method Investments [Line Items]
Gain on sale of investments in unconsolidated entities				$ 5,463,484			$ 8,272,590
Vantage At Germantown [Member]
Schedule Of Equity Method Investments [Line Items]
Cash received		$ 16,100,000
Income on sale of properties		862,000
Gain on sale of investments in unconsolidated entities		$ 2,800,000
Vantage at Loveland [Member]
Schedule Of Equity Method Investments [Line Items]
Equity commitment of fund construction								$ 16.3
Increase in equity commitment of fund construction upon certain events								$ 18,200,000
Vantage at Helotes [Member]
Schedule Of Equity Method Investments [Line Items]
Equity commitment of fund construction	$ 12.6
Vantage At Powdersville [Member]
Schedule Of Equity Method Investments [Line Items]
Cash received	20,100,000
Income on sale of properties	2,400,000
Gain on sale of investments in unconsolidated entities	$ 5,500,000
Vantage At Westover Hills [Member]
Schedule Of Equity Method Investments [Line Items]
Equity commitment of fund construction									$ 7,300,000
Vantage at Waco [Member]
Schedule Of Equity Method Investments [Line Items]
Cash received			$ 10,300,000
Income on sale of properties			$ 931,000		$ 201,000	$ 373,000
ATAX Vantage Holdings, LLC [Member] | Minimum [Member]
Schedule Of Equity Method Investments [Line Items]
Return on investment period							2 years
ATAX Vantage Holdings, LLC [Member] | Maximum [Member]
Schedule Of Equity Method Investments [Line Items]
Return on investment period							3 years