Mortgage Revenue Bonds - Schedule of MRBs Redeemed (Details)		12 Months Ended
		Dec. 31, 2021 USD ($) Unit	Dec. 31, 2020 USD ($) Unit
Arby Road Apartments [Member] | Series A [Member] | Las Vegas, NV [Member]
Schedule Of Available For Sale Securities [Line Items]
Units	[1]		180
Original Maturity Date	[1]		Oct. 01, 2027
Interest Rate	[1]		5.35%
Arby Road Apartments [Member] | Series A [Member] | Las Vegas, NV [Member]
Schedule Of Available For Sale Securities [Line Items]
Units	[1]		180
Original Maturity Date	[1]		Apr. 01, 2041
Interest Rate	[1]		5.50%
Mortgage Revenue Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Principal Outstanding at Date of Redemption | $		$ 43,830,074	$ 9,583,000
Mortgage Revenue Bonds [Member] | Solano Vista [Member] | Series B [Member] | Vallejo, CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed			January
Units			96
Original Maturity Date			Jan. 01, 2021
Interest Rate			5.85%
Principal Outstanding at Date of Redemption | $			$ 3,103,000
Mortgage Revenue Bonds [Member] | Montevista [Member] | Series B [Member] | San Pablo, CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed			August
Units			82
Original Maturity Date			Jul. 01, 2021
Interest Rate			8.00%
Principal Outstanding at Date of Redemption | $			$ 6,480,000
Mortgage Revenue Bonds [Member] | Arby Road Apartments [Member] | Series A [Member] | Las Vegas, NV [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed	[2]	March
Units	[2]	180
Original Maturity Date	[2]	Oct. 01, 2027
Interest Rate	[2]	5.35%
Principal Outstanding at Date of Redemption | $	[2]	$ 1,600,000
Mortgage Revenue Bonds [Member] | Arby Road Apartments [Member] | Series A [Member] | Las Vegas, NV [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed	[2]	March
Units	[2]	180
Original Maturity Date	[2]	Apr. 01, 2041
Interest Rate	[2]	5.50%
Principal Outstanding at Date of Redemption | $	[2]	$ 5,785,000
Mortgage Revenue Bonds [Member] | Rosewood Townhomes [Member] | Series A [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed		July
Units		100
Original Maturity Date		Jul. 01, 2055
Interest Rate		5.75%
Principal Outstanding at Date of Redemption | $		$ 9,259,206
Mortgage Revenue Bonds [Member] | Rosewood Townhomes [Member] | Series B [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed		July
Units		100
Original Maturity Date		Aug. 01, 2055
Interest Rate		12.00%
Principal Outstanding at Date of Redemption | $		$ 469,781
Mortgage Revenue Bonds [Member] | South Pointe Apartments [Member] | Series A [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed		July
Units		256
Original Maturity Date		Jul. 01, 2055
Interest Rate		5.75%
Principal Outstanding at Date of Redemption | $		$ 21,551,600
Mortgage Revenue Bonds [Member] | South Pointe Apartments [Member] | Series B [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed		July
Units		256
Original Maturity Date		Aug. 01, 2055
Interest Rate		12.00%
Principal Outstanding at Date of Redemption | $		$ 1,099,487
Mortgage Revenue Bonds [Member] | Woodlynn Village [Member] | Maplewood Minnesota [Member]
Schedule Of Available For Sale Securities [Line Items]
Month Redeemed		November
Units		59
Original Maturity Date		Nov. 01, 2042
Interest Rate		6.00%
Principal Outstanding at Date of Redemption | $		$ 4,065,000

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

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