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Mortgage Revenue Bonds - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2024 | Jul. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Jan. 01, 2023 | Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  | $ 21,820,973 | $ 20,537,399 | $ 60,920,706 | $ 62,255,855 |  |  |  |  |
Allowance for credit losses |  |  |  |  |  |  |  |  |  | $ 5,900,000 |
Finace receivable, allowance for credit losses |  |  | 3,254,000 | 4,563,000 | 3,254,000 | 4,563,000 | $ 3,480,000 | $ 4,097,000 | $ 5,125,000 |  | $ 495,000
Recovery of prior credit loss |  |  |  |  | (51,844) | (51,656) |  |  |  |  |
Post-Conversion Principal |  |  | 56,050,000 | $ 100,445,000 | 56,050,000 | $ 100,445,000 |  |  |  |  |
Principal Outstanding at Date of Redemption |  |  | 23,073,000 |  | 23,073,000 |  |  |  |  |  |
Mortgage Revenue Bond [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrued interest receivable |  |  | $ 5,100,000 |  | 5,100,000 |  |  | $ 4,700,000 |  |  |
Finace receivable, allowance for credit losses |  | $ 365,000 |  |  |  |  |  |  |  |  |
Recovery of prior credit loss | $ (169,000) | (169,000) |  |  |  |  |  |  |  |  |
Ocotillo Springs Series A [Member] | Mortgage Revenue Bond [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Post-Conversion Principal |  | 4,000,000 |  |  |  |  |  |  |  |  |
Ocotillo Springs Series A 1 [Member] | Mortgage Revenue Bond [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Post-Conversion Principal |  | $ 500,000 |  |  |  |  |  |  |  |  |
Brookstone [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Realized a gain on sale of the Brookstone MRB |  |  |  |  | 1,000,000 |  |  |  |  |  |
Southpark [Member] | Mortgage Revenue Bond [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  |  |  | $ 1,100,000 |  |  |  |  |  |

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