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Mortgages and Other Notes Payable - Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Feb. 28, 2023	Dec. 31, 2022
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and other notes payable	$ 187,179		$ 188,004
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	$ 11,345		11,406
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 other notes payable	$ 1,155		1,155
Effective interest rate	4.00%
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	$ 9,631		9,673
Effective 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	$ 3,405		3,424
Effective interest rate	2.85%
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	$ 7,834		7,875
Effective 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
Effective 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	$ 7,092		7,128
Effective interest rate	3.75%
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 other notes payable	$ 14,099		14,161
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 other notes payable	$ 12,960		13,039
Effective interest rate	3.60%
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 other notes payable	$ 3,542		3,542
Effective interest rate	6.00%
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	$ 11,591		11,656
Effective 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	$ 16,653		16,737
Effective 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	$ 15,744		15,789
Effective 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
Effective 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	$ 10,573		10,622
Effective 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	$ 19,310		19,410
Effective 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	$ 9,326		9,373
Effective 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	$ 8,462		8,504
Effective 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	$ 9,634		9,674
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 other notes payable	$ 6,387		$ 6,400
Effective interest rate	7.75%	7.75%

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