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Mortgages and Other Notes Payable - Schedule of Debt (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Aug. 25, 2021 | Jun. 04, 2021 | Mar. 04, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 183,392 |  |  |  | $ 242,711
600 Las Colinas |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 0 |  |  |  | 35,589
Interest Rate | 5.30% |  |  |  |
770 South Post Oak |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 11,635 |  |  |  | 11,871
Interest Rate | 4.40% |  |  |  |
Athens |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 1,155 |  |  |  | 1,155
Interest Rate | 4.00% |  |  |  |
Chelsea |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 8,037 |  |  |  | 8,194
Interest Rate | 3.40% |  |  |  |
EQK Portage - Land |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 3,350 |  |  |  | 3,350
Interest Rate | 10.00% |  |  |  |
HSW Partners |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 0 |  |  |  | 17,790
Interest Rate | 9.50% |  |  |  |
Forest Grove |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 7,263 |  |  |  | 7,333
Interest Rate | 3.75% |  |  |  |
Forest Grove | Prime Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable interest rate | 0.50% |  |  |  |
Landing Bayou |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 14,407 |  |  |  | 14,643
Interest Rate | 3.50% |  |  |  |
Legacy at Pleasant Grove |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 13,352 |  |  |  | 13,653
Interest Rate | 3.60% |  |  |  |
McKinney 36 Land |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 0 |  |  |  | 820
Interest Rate | 8.00% |  |  |  |
New Concept Energy |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 3,542 |  |  |  | 3,542
Interest Rate | 6.00% |  |  |  |
Overlook at Allensville Phase II |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 0 |  |  |  | 15,621
Interest Rate | 3.80% |  |  |  |
Parc at Denham Springs Phase II |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 15,962 |  |  |  | 16,128
Interest Rate | 4.10% |  |  |  |
RCM HC Enterprises |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 5,086 |  |  |  | 0
Interest Rate | 9.50% |  |  |  |
RCM HC Enterprises | Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable |  |  | $ 1,986 |  |
Stanford Center |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 38,979 |  |  |  | 39,093
Interest Rate | 6.00% |  |  |  |
Sugar Mill Phase III |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 9,216 |  |  |  | 9,298
Interest Rate | 4.50% |  |  |  |
Toulon |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 13,697 |  |  |  | 13,975
Interest Rate | 3.20% |  |  |  |
Villas at Bon Secour |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 19,492 |  |  |  | 10,280
Interest Rate | 3.08% |  |  |  |
Villas at Bon Secour | Mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable |  | $ 20,015 |  |  |
Interest Rate |  | 3.08% |  |  |
Vista Ridge |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 9,830 |  |  |  | 9,979
Interest Rate | 4.00% |  |  |  |
Windmill Farms |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and other notes payable | $ 8,389 |  |  |  | $ 10,397
Interest Rate | 5.00% |  |  | 5.00% |

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