Mortgages and Other Notes Payable - Schedule of Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 08, 2024	Feb. 28, 2023
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and other notes payable	$ 179,141	$ 184,462
Loss on early extinguishment of debt	1,710	2,805	$ 1,451
Mortgages and Other Notes Payable
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and other notes payable	179,141	184,462
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 other notes payable	$ 11,187	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]
Mortgages and other notes payable	$ 0	1,155
Interest Rate	4.00%
Mortgages and Other Notes Payable | Chelsea
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and other notes payable	$ 8,064	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]
Mortgages and other notes payable	$ 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]
Mortgages and other notes payable	$ 6,988	7,128
Interest Rate	3.75%
Mortgages and Other Notes Payable | Landing on Bayou Cane
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and other notes payable	$ 14,442	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]
Mortgages and other notes payable	$ 12,716	13,039
Interest Rate	3.60%
Mortgages and Other Notes Payable | Northside on Travis
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and other notes payable	$ 11,394	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]
Mortgages and other notes payable	$ 16,399	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]
Mortgages and other notes payable	$ 15,608	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]
Mortgages and other notes payable	$ 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]
Mortgages and other notes payable	$ 10,424	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]
Mortgages and other notes payable	$ 19,205	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]
Mortgages and other notes payable	$ 9,181	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]
Mortgages and other notes payable	$ 8,334	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]
Mortgages and other notes payable	$ 9,512	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]
Mortgages and other notes payable	$ 4,399	6,400
Interest Rate	7.75%				7.75%
Mortgages and Other Notes Payable | Windmill Farms | Subsequent Event
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate				7.50%
Mortgages and Other Notes Payable | Blue Lake Villas
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and other notes payable	$ 9,503	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]
Mortgages and other notes payable	$ 3,349	$ 3,424
Interest Rate	2.85%