Debt Financing - Schedule of Total Debt Financing (Details) - USD ($)		1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
		Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Debt Instrument [Line Items]
Debt financing				$ 760,632,414	$ 673,957,640
Period End Rates				4.36%
Variable - Notes [Member] | Mizuho Capital Markets [Member]
Debt Instrument [Line Items]
Debt financing						$ 103,500,000
Restricted Cash						$ 77,500,000
TEBS Financings [Member] | Fixed - M24 [Member]
Debt Instrument [Line Items]
Debt financing				$ 39,435,294	39,825,019
Restricted Cash				$ 4,000	$ 238,760
Year Acquired				2010	2010
Stated Maturities				2027-05	2027-05
Reset Frequency				N/A	N/A
Variable Rate Index				N/A	N/A
Period End Rates				3.05%	3.05%
TEBS Financings [Member] | Variable - M31 [Member]
Debt Instrument [Line Items]
Debt financing	[1]			$ 77,340,279	$ 78,272,018
Restricted Cash	[1]			$ 4,999	$ 4,999
Year Acquired	[1]			2014	2014
Stated Maturities	[1]			2024-07	2024-07
Reset Frequency	[1]			Weekly	Weekly
Variable Rate Index	[1]			SIFMA	SIFMA
Index Based Rates	[1]			0.05%	0.12%
Spread/ Facility Fees	[1]			1.27%	1.34%
Period End Rates	[1]			1.32%	1.46%
TEBS Financings [Member] | Fixed - M33 [Member]
Debt Instrument [Line Items]
Debt financing				$ 30,345,610	$ 30,796,097
Restricted Cash				$ 2,606	$ 2,606
Year Acquired				2015	2015
Stated Maturities				2030-09	2030-09
Reset Frequency				N/A	N/A
Variable Rate Index				N/A	N/A
Period End Rates				3.24%	3.24%
TEBS Financings [Member] | Fixed - M45 [Member]
Debt Instrument [Line Items]
Debt financing	[2]			$ 214,415,750	$ 215,825,022
Restricted Cash	[2]			$ 5,000	$ 5,000
Year Acquired	[2]			2018	2018
Stated Maturities	[2]			2034-07	2034-07
Reset Frequency	[2]			N/A	N/A
Variable Rate Index	[2]			N/A	N/A
Period End Rates	[2]			3.82%	3.82%
Secured Line Of Credit Facility [Member] | Variable - Notes [Member]
Debt Instrument [Line Items]
Debt financing				$ 102,872,192	$ 103,086,756
Restricted Cash				$ 77,530,879	$ 77,500,000
Year Acquired				2020	2020
Stated Maturities				2025-09	2025-09
Reset Frequency				Monthly	Monthly
Variable Rate Index				3-month LIBOR	3-month LIBOR
Index Based Rates				0.12%	0.22%
Spread/ Facility Fees				9.00%	9.00%
Period End Rates	[3]			9.12%	9.22%
TOB Trusts Securitization [Member] | Variable - TOB I [Member] | Mizuho Capital Markets [Member]
Debt Instrument [Line Items]
Debt financing				$ 9,034,467	$ 1,765,167
Year Acquired				2020	2020
Stated Maturities				2022-07	2022-07
Reset Frequency				Weekly	Weekly
Variable Rate Index				SIFMA	SIFMA
Index Based Rates				0.21%	0.29%
Spread/ Facility Fees				0.89%	0.89%
Period End Rates				1.10%	1.18%
TOB Trusts Securitization [Member] | Variable - TOB II [Member] | Mizuho Capital Markets [Member]
Debt Instrument [Line Items]
Debt financing				$ 10,032,675	$ 122,724,862
Year Acquired				2021	2019
Stated Maturities				2023-02	2023-07
Reset Frequency				Weekly	Weekly
Variable Rate Index				SIFMA	SIFMA
Index Based Rates				0.21%
Spread/ Facility Fees				1.42%
Period End Rates				1.63%
TOB Trusts Securitization [Member] | Variable - TOB II [Member] | Mizuho Capital Markets [Member] | Minimum [Member]
Debt Instrument [Line Items]
Index Based Rates					0.29%
Spread/ Facility Fees					1.17%
Period End Rates					1.46%
TOB Trusts Securitization [Member] | Variable - TOB II [Member] | Mizuho Capital Markets [Member] | Maximum [Member]
Debt Instrument [Line Items]
Index Based Rates					0.39%
Spread/ Facility Fees					1.67%
Period End Rates					2.06%
TOB Trusts Securitization [Member] | Variable - TOB III [Member] | Mizuho Capital Markets [Member]
Debt Instrument [Line Items]
Debt financing				$ 4,127,846	$ 62,992,845
Year Acquired				2021	2020
Stated Maturities				2023-04	2023-09
Reset Frequency				Weekly	Weekly
Variable Rate Index				SIFMA	OBFR
Index Based Rates				0.21%	0.33%
Spread/ Facility Fees				1.27%	0.89%
Period End Rates				1.48%	1.22%
TOB Trusts Securitization [Member] | Variable - TOB IV [Member] | Mizuho Capital Markets [Member]
Debt Instrument [Line Items]
Debt financing				$ 96,716,042	$ 5,668,324
Year Acquired				2019	2020
Stated Maturities				2023-07	2023-12
Reset Frequency				Weekly	Weekly
Variable Rate Index				SIFMA	SIFMA
Index Based Rates					0.29%
Spread/ Facility Fees					1.27%
Period End Rates					1.56%
TOB Trusts Securitization [Member] | Variable - TOB IV [Member] | Mizuho Capital Markets [Member] | Minimum [Member]
Debt Instrument [Line Items]
Index Based Rates				0.21%
Spread/ Facility Fees				1.17%
Period End Rates				1.38%
TOB Trusts Securitization [Member] | Variable - TOB IV [Member] | Mizuho Capital Markets [Member] | Maximum [Member]
Debt Instrument [Line Items]
Index Based Rates				0.25%
Spread/ Facility Fees				1.67%
Period End Rates				1.92%
TOB Trusts Securitization [Member] | Variable - TOB V [Member] | Mizuho Capital Markets [Member]
Debt Instrument [Line Items]
Debt financing				$ 100,813,059
Year Acquired				2020
Stated Maturities				2023-09
Reset Frequency				Weekly
Variable Rate Index				OBFR
Index Based Rates				0.26%
Spread/ Facility Fees				0.89%
Period End Rates				1.15%
TOB Trusts Securitization [Member] | Variable - TOB VI [Member] | Mizuho Capital Markets [Member]
Debt Instrument [Line Items]
Debt financing				$ 5,680,103
Year Acquired				2020
Stated Maturities				2023-12
Reset Frequency				Weekly
Variable Rate Index				SIFMA
Index Based Rates				0.21%
Spread/ Facility Fees				1.27%
Period End Rates				1.48%
TOB Trusts Securitization [Member] | Fixed - Term TOB [Member] | Morgan Stanley Bank [Member]
Debt Instrument [Line Items]
Debt financing				$ 12,936,258	$ 13,001,530
Year Acquired				2019	2019
Stated Maturities		2024-05	2022-05	2024-05	2022-05
Reset Frequency				N/A	N/A
Variable Rate Index				N/A	N/A
Period End Rates		1.98%	3.53%	1.98%	3.53%
TOB Trusts Securitization [Member] | Variable - TOB VII [Member] | Mizuho Capital Markets [Member]
Debt Instrument [Line Items]
Debt financing				$ 52,531,175
Year Acquired				2021
Stated Maturities				2024-01
Reset Frequency				Weekly
Variable Rate Index				OBFR
Index Based Rates				0.26%
Spread/ Facility Fees				0.89%
Period End Rates				1.15%
TOB Trusts Securitization [Member] | Variable - TOB VIII [Member] | Mizuho Capital Markets [Member]
Debt Instrument [Line Items]
Debt financing				$ 4,351,664
Year Acquired				2021
Stated Maturities				2024-07
Reset Frequency				Weekly
Variable Rate Index				OBFR
Index Based Rates				0.26%
Spread/ Facility Fees				1.16%
Period End Rates				1.42%

[1] Facility fees have a variable component

[2] The M45 TEBS has an initial interest rate of 3.82% through July 31, 2023. From August 1, 2023 through the stated maturity date, the interest rate is 4.39%. These rates are inclusive of credit enhancement fees payable to Freddie Mac.

[3] The Partnership has entered into two total return swap transactions with the Secured Notes as the reference security and notional amounts totaling the outstanding principal on the Secured Notes. The total return swaps effectively net down the interest rate on the Secured Notes. Considering the effect of the total return swaps, the effective net interest rate is 4.25% for approximately $39.7 million of the Secured Notes and 1.00% for approximately $63.5 million of the Secured Notes as of September 30, 2021. See Note 18 for further information on the total return swaps.