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Mortgages and Other Notes Payable - Schedule of Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Feb. 28, 2023 | Dec. 31, 2022
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying Value | $ 182,428 |  | $ 188,004
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 | $ 11,248 |  | 11,406
Interest Rate | 4.40% |  |
Mortgages and Other Notes Payable | Athens |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying Value | $ 0 |  | 1,155
Interest Rate | 4.00% |  |
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 | $ 9,546 |  | 9,673
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 | $ 3,368 |  | 3,424
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 | $ 7,749 |  | 7,875
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 | 10.00% |  |
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 | $ 7,023 |  | 7,128
Interest Rate | 3.75% |  |
Mortgages and Other Notes Payable | Landing Bayou |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying Value | $ 13,971 |  | 14,161
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 | $ 12,798 |  | 13,039
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 | 6.00% |  |
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 | $ 11,460 |  | 11,656
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 | $ 16,484 |  | 16,737
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 | $ 15,654 |  | 15,789
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 | $ 10,474 |  | 10,622
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 | $ 19,119 |  | 19,410
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 | $ 9,230 |  | 9,373
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 | $ 8,377 |  | 8,504
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 | $ 9,553 |  | 9,674
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 | $ 4,396 |  | $ 6,400
Interest Rate | 7.75% | 7.75% |

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