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Mortgages and Other Notes Payable - Schedule of Debt (Details) $ in Thousands | Mar. 15, 2023 USD ($) extension_option | Sep. 30, 2024 USD ($) | Jul. 10, 2024 USD ($) | Feb. 08, 2024 | Dec. 31, 2023 USD ($)
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 183,814 |  |  | $ 182,683
Alera |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Proceeds from construction loans payable | $ 33,000 |  |  |  |
Variable interest rate | 3.00% |  |  |  |
Number of extension options | extension_option | 2 |  |  |  |
Mortgages and Other Notes Payable |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Interest Rate |  |  | 1.85% |  |
Loan on property |  |  | $ 6,558 |  |
Mortgages and Other Notes Payable | 770 South Post Oak |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 11,002 |  |  | 11,187
Interest Rate |  | 4.40% |  |  |
Mortgages and Other Notes Payable | Alera |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 4,148 |  |  | 0
Interest Rate |  | 8.20% |  |  |
Mortgages and Other Notes Payable | Blue Lake Villas |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 9,371 |  |  | 9,503
Interest Rate |  | 3.15% |  |  |
Mortgages and Other Notes Payable | Blue Lake Villas Phase II |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 3,291 |  |  | 3,349
Interest Rate |  | 2.85% |  |  |
Mortgages and Other Notes Payable | Chelsea |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 7,925 |  |  | 8,064
Interest Rate |  | 3.40% |  |  |
Mortgages and Other Notes Payable | EQK Portage |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 3,350 |  |  | 3,350
Interest Rate |  | 5.00% |  |  |
Mortgages and Other Notes Payable | Forest Grove |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 6,415 |  |  | 6,988
Interest Rate |  | 7.50% |  |  |
Mortgages and Other Notes Payable | Landing on Bayou Cane |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 14,233 |  |  | 14,442
Interest Rate |  | 3.50% |  |  |
Mortgages and Other Notes Payable | Legacy at Pleasant Grove |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 12,466 |  |  | 12,716
Interest Rate |  | 3.60% |  |  |
Mortgages and Other Notes Payable | New Concept Energy |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 3,542 |  |  | 3,542
Interest Rate |  | 5.33% |  |  |
Mortgages and Other Notes Payable | Northside on Travis |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 11,193 |  |  | 11,394
Interest Rate |  | 2.50% |  |  |
Mortgages and Other Notes Payable | Parc at Denham Springs |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 16,137 |  |  | 16,399
Interest Rate |  | 3.75% |  |  |
Mortgages and Other Notes Payable | Parc at Denham Springs Phase II |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 15,467 |  |  | 15,608
Interest Rate |  | 4.05% |  |  |
Mortgages and Other Notes Payable | RCM HC Enterprises |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 5,086 |  |  | 5,086
Interest Rate |  | 5.00% |  |  |
Mortgages and Other Notes Payable | Residences at Holland Lake |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 10,271 |  |  | 10,424
Interest Rate |  | 3.60% |  |  |
Mortgages and Other Notes Payable | Villas at Bon Secour |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 18,902 |  |  | 19,205
Interest Rate |  | 3.08% |  |  |
Mortgages and Other Notes Payable | Villas of Park West I |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 9,033 |  |  | 9,181
Interest Rate |  | 3.04% |  |  |
Mortgages and Other Notes Payable | Villas of Park West II |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 8,203 |  |  | 8,334
Interest Rate |  | 3.18% |  |  |
Mortgages and Other Notes Payable | Vista Ridge |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 9,386 |  |  | 9,512
Interest Rate |  | 4.00% |  |  |
Mortgages and Other Notes Payable | Windmill Farms |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Carrying Value |  | $ 4,393 |  |  | $ 4,399
Interest Rate |  | 7.50% |  | 7.50% |

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