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Mortgage Revenue Bonds - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]
Investment income		$ 18,301,211	$ 21,820,973	$ 61,004,197	$ 60,920,706
Mortgage Revenue Bond [Member]
Schedule Of Available For Sale Securities [Line Items]
Accrued interest receivable		5,400,000		5,400,000		$ 5,300,000
Outstanding principal		165,400,000		165,400,000
Proceeds received from final settlements	$ 365,000
Recovery of prior credit loss	$ 169,000				169,000
Taxable MRB [Member]
Schedule Of Available For Sale Securities [Line Items]
Outstanding principal		$ 9,000,000		9,000,000
Brookstone [Member]
Schedule Of Available For Sale Securities [Line Items]
Realized a gain on sale					1,000,000
Residency at the Entrepreneur MRBs and Residency at Mayer MRBs and Residency at the Entrepreneur MRBs | Mortgage Revenue Bond [Member]
Schedule Of Available For Sale Securities [Line Items]
Partnership recognized loan fee				$ 709,000
Companion at Thornhill Apartments [Member]
Schedule Of Available For Sale Securities [Line Items]
Redeemed percentage of par value plus accrued interest		102.00%		102.00%
Companion at Thornhill Apartments [Member] | Contingent Interest Income [Member]
Schedule Of Available For Sale Securities [Line Items]
Redemption premium amount				$ 208,000
Southpark [Member] | Mortgage Revenue Bond [Member]
Schedule Of Available For Sale Securities [Line Items]
Investment income					$ 1,100,000

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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Net gain (loss) resulting from the sales of securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages).

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