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Mortgages and Other Notes Payable - Schedule of Debt (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Mar. 04, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Mortgages and notes payable | $ 224,817 | $ 242,711 |
Mortgages and other notes payable | 600 Las Colinas |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Mortgages and notes payable | $ 35,396 | 35,589 |
Effective Interest Rate | 5.30% |  |
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] |  |  |
Mortgages and notes payable | $ 11,816 | 11,871 |
Effective 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] |  |  |
Mortgages and notes payable | $ 1,155 | 1,155 |
Effective Interest Rate | 5.90% |  |
Mortgages and other notes payable | Chelsea |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Mortgages and notes payable | $ 8,154 | 8,194 |
Effective Interest Rate | 3.40% |  |
Mortgages and other notes payable | EQK Portage - Land |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Mortgages and notes payable | $ 3,350 | 3,350 |
Effective Interest Rate | 10.00% |  |
Mortgages and other notes payable | HSW Partners |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Mortgages and notes payable | $ 17,802 | 17,790 |
Effective Interest Rate | 9.50% |  |
Mortgages and other notes payable | Forest Grove |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Mortgages and notes payable | $ 7,333 | $ 7,333 |
Effective Interest Rate | 3.75% |  |
Mortgages and other notes payable | Forest Grove | Prime Rate |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Variable interest rate | 0.50% | 0.50% |
Mortgages and other notes payable | Landing Bayou |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Mortgages and notes payable | $ 14,584 | $ 14,643 |
Effective 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] |  |  |
Mortgages and notes payable | $ 13,579 | 13,653 |
Effective Interest Rate | 3.60% |  |
Mortgages and other notes payable | McKinney 36 Land |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Mortgages and notes payable | $ 783 | 820 |
Effective Interest Rate | 8.00% |  |
Mortgages and other notes payable | New Concept Energy |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Mortgages and notes payable | $ 3,542 | 3,542 |
Effective Interest Rate | 6.00% |  |
Mortgages and other notes payable | Overlook at Allenville Phase II |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Mortgages and notes payable | $ 0 | 15,621 |
Effective Interest Rate | 3.80% |  |
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] |  |  |
Mortgages and notes payable | $ 16,087 | 16,128 |
Effective Interest Rate | 4.10% |  |
Mortgages and other notes payable | Stanford Center |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Mortgages and notes payable | $ 39,125 | 39,093 |
Effective Interest Rate | 6.00% |  |
Mortgages and other notes payable | Sugar Mill Phase III |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Mortgages and notes payable | $ 9,278 | 9,298 |
Effective Interest Rate | 4.50% |  |
Mortgages and other notes payable | Toulon |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Mortgages and notes payable | $ 13,914 | 13,975 |
Effective Interest Rate | 3.20% |  |
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] |  |  |
Mortgages and notes payable | $ 10,226 | 10,280 |
Effective Interest Rate | 4.00% |  |
Mortgages and other notes payable | Vista Ridge |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Mortgages and notes payable | $ 9,942 | 9,979 |
Effective 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] |  |  |
Mortgages and notes payable | $ 8,751 | $ 10,397 |
Effective Interest Rate | 6.00% |  | 5.00%

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