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Mortgages and Other Notes Payable - Schedule of Debt (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Aug. 25, 2021 | Jun. 04, 2021 | Mar. 04, 2021 | Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Mortgages and notes payable | $ 185,004 |  |  |  | $ 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 | $ 0 |  |  |  | 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 | $ 11,709 |  |  |  | 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 | $ 8,077 |  |  |  | 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 | $ 0 |  |  |  | 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 | $ 7,295 |  |  |  | 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% |  |  |  |
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 | $ 14,467 |  |  |  | 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 | $ 13,428 |  |  |  | 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 | $ 705 |  |  |  | 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 | $ 16,004 |  |  |  | 16,128
Effective Interest Rate | 4.10% |  |  |  |
Mortgages and other notes payable | RCM HC Enterprises |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Mortgages and notes payable | $ 5,086 |  | $ 1,986 |  | 0
Effective Interest Rate | 9.50% |  |  |  |
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 | $ 39,044 |  |  |  | 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 | $ 9,237 |  |  |  | 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 | $ 13,786 |  |  |  | 13,975
Effective Interest Rate | 3.20% |  |  |  |
Mortgages and other notes payable | Villas at Bon Secour(6) |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Mortgages and notes payable | $ 19,495 | $ 20,015 |  |  | 10,280
Effective Interest Rate | 4.00% | 3.08% |  |  |
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 | $ 9,868 |  |  |  | 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 | $ 8,756 |  |  |  | $ 10,397
Effective Interest Rate | 6.00% |  |  | 5.00% |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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