Mortgage Revenue Bonds - Schedule of MRBs Acquisitions (Details)		9 Months Ended
		Sep. 30, 2021 USD ($) Unit	Sep. 30, 2020 USD ($) Unit
Schedule Of Available For Sale Securities [Line Items]
Units | Unit		4,332
Initial Principal Acquired | $			$ 9,498,500
Jackson Manor Apartments [member] | Jackson, MS [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Acquired	[1]	April
Units | Unit	[1]	60
Maturity Date	[1]	May 01, 2038
Interest Rate	[1]	5.00%
Initial Principal Acquired | $	[1]	$ 4,150,000
Arby Road Apartments [Member] | Las Vegas, NV [Member] | Series A [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Acquired	[2]		June
Units | Unit	[2]		180
Maturity Date	[2]		Oct. 01, 2027
Interest Rate	[2]		5.35%
Initial Principal Acquired | $	[2]		$ 1,690,000
Arby Road Apartments [Member] | Las Vegas, NV [Member] | Series A [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Acquired	[2]		June
Units | Unit	[2]		180
Maturity Date	[2]		Apr. 01, 2041
Interest Rate	[2]		5.50%
Initial Principal Acquired | $	[2]		$ 5,785,000
Ocotillo Springs [Member] | Brawley, CA [Member] | Series A [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Acquired	[3]		July
Units | Unit	[3]		75
Maturity Date	[3]		Aug. 01, 2037
Interest Rate	[3],[4]		4.55%
Initial Principal Acquired | $	[3]		$ 2,023,500

[1] The Partnership has committed to provide total funding of the MRB up to $6.9 million during the acquisition and rehabilitation phase of the property on a drawdown basis. Upon stabilization of the property, the MRB will be partially repaid and the maximum balance of the MRB after stabilization will not exceed $4.8 million

[2] Both MRBs are part of the same series but have different interest rates and maturity dates.

[3] The Partnership has committed to provide total funding of the MRB up to $15.0 million during construction and lease-up of the property on a drawdown basis. Upon stabilization of the property, the MRB will be partially repaid and the maximum balance of the MRB after stabilization is approximately $3.5 million

[4] The MRB has a variable interest rate equal to 1-month LIBOR plus 3.25%, subject to a floor of 4.55%, during construction of the project until stabilization. After stabilization, the MRB will convert to a fixed interest rate of 4.35%