Mortgage Revenue Bonds - Schedule of MRB Redeemed (Details) - Mortgage Revenue Bonds [Member]		6 Months Ended
		Jun. 30, 2022 USD ($) Unit	Jun. 30, 2021 USD ($) Unit		Jan. 31, 2022 USD ($)
Schedule Of Available For Sale Securities [Line Items]
Principal Outstanding at Date of Redemption		$ 24,103,840	$ 7,385,000	[1]	$ 61,055,000
Arby Road Apartments [Member] | Series A [Member] | Las Vegas, NV [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed	[1]		March
Units | Unit	[1]		180
Original Maturity Date	[1]		Oct. 01, 2027
Interest Rate	[1]		5.35%
Principal Outstanding at Date of Redemption	[1]		$ 1,600,000
Arby Road Apartments [Member] | Series A [Member] | Las Vegas, NV [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed	[1]		March
Units | Unit	[1]		180
Original Maturity Date	[1]		Apr. 01, 2041
Interest Rate	[1]		5.50%
Principal Outstanding at Date of Redemption	[1]		$ 5,785,000
Ohio Properties [Member] | Series A [Member] | Crescent Village, Willow Bend and Postwoods [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed	[2]	March
Units | Unit	[2]	362
Original Maturity Date	[2]	Jun. 01, 2050
Interest Rate	[2]	7.00%
Principal Outstanding at Date of Redemption	[2]	$ 13,544,000
Ohio Properties [Member] | Series B [Member] | Crescent Village, Willow Bend and Postwoods [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed	[2]	March
Units | Unit	[2]	362
Original Maturity Date	[2]	Jun. 01, 2050
Interest Rate	[2]	10.00%
Principal Outstanding at Date of Redemption	[2]	$ 3,459,840
Bridle Ridge [Member] | Greer, SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed		May
Units | Unit		152
Original Maturity Date		Jan. 01, 2043
Interest Rate		6.00%
Principal Outstanding at Date of Redemption		$ 7,100,000

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

[2] The Ohio Properties consist of Crescent Village, located in Cincinnati, Ohio, Willow Bend, located in Columbus (Hilliard), Ohio and Postwoods, located in Reynoldsburg, Ohio.