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Mortgage Revenue Bonds - Schedule of MRBs Redeemed (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) Unit	Dec. 31, 2023 USD ($) Unit
Schedule Of Available For Sale Securities [Line Items]
Principal Outstanding at Date of Redemption	$ 23,073,000
Redemption of Mortgage Revenue Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Principal Outstanding at Date of Redemption	$ 21,615,000	$ 8,493,040
Redemption of Mortgage Revenue Bonds [Member] | Southpark [Member] | Austin Texas [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed	July 2024
Units | Unit	192
Original Maturity Date	Dec. 01, 2049
Interest Rate	6.13%
Principal Outstanding at Date of Redemption	$ 12,300,000
Redemption of Mortgage Revenue Bonds [Member] | Runnymede [Member] | Austin Texas [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed	August 2024
Units | Unit	252
Original Maturity Date	Oct. 01, 2024
Interest Rate	6.00%
Principal Outstanding at Date of Redemption	$ 9,315,000
Redemption of Mortgage Revenue Bonds [Member] | Greens Property [Member] | Series A [Member] | Durham, NC [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed		February 2023
Units | Unit		168
Original Maturity Date		Oct. 01, 2047
Interest Rate		6.50%
Principal Outstanding at Date of Redemption		$ 7,579,000
Redemption of Mortgage Revenue Bonds [Member] | Greens Property [Member] | Series B [Member] | Durham, NC [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed		February 2023
Units | Unit		168
Original Maturity Date		Oct. 01, 2047
Interest Rate		12.00%
Principal Outstanding at Date of Redemption		$ 914,040

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