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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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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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