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Debt (Details) - USD ($)				1 Months Ended						3 Months Ended		4 Months Ended	9 Months Ended
Debt (Details) - USD ($)	Sep. 01, 2022	Jun. 30, 2022	May 01, 2022	Sep. 30, 2022	Aug. 31, 2022	Jul. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Aug. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Nov. 03, 2022	Sep. 30, 2022	Sep. 30, 2021	Jun. 01, 2022	May 31, 2022	Apr. 30, 2022	Dec. 31, 2021	Apr. 22, 2020
Debt Instrument [Line Items]
Debt				$ 124,170,000						$ 124,170,000			$ 124,170,000					$ 106,648,000
Unamortized debt issuance costs				1,200,000						1,200,000			1,200,000					1,200,000
CARES Act, proceeds from loans payable																			$ 4,000,000
Net gain on extinguishment of debt										0	$ 3,680,000		0	$ 3,454,000
Interest costs incurred										1,800,000	2,200,000		4,400,000	6,600,000
Interest costs capitalized										$ 1,800,000	$ 1,300,000		$ 4,300,000	$ 3,900,000
Common Stock, Dividends, Per Share, Declared	$ 4.67									$ 4.67	$ 0		$ 4.67	$ 0
Dividends, Common Stock, Cash	$ 40,000,000
Stock Repurchase Program, Authorized Amount	$ 10,000,000
Dividends Payable				1,300,000						$ 1,300,000			$ 1,300,000
Stock Repurchased During Period, Value										$ 799,000
Stock Repurchased During Period, Shares										33,958
Treasury Stock Acquired, Average Cost Per Share										$ 23.49
Subsequent event
Debt Instrument [Line Items]
Stock Repurchased During Period, Value												$ 2,600,000
Stock Repurchased During Period, Shares												105,415
Treasury Stock Acquired, Average Cost Per Share												$ 25.02
Stock Repurchase Program, Remaining Authorized Repurchase Amount												$ 7,400,000
Comerica Bank credit facility
Debt Instrument [Line Items]
Debt				0						$ 0			0					0
Comerica Bank credit facility \| Revolving Credit Facility \| Bloomberg short-term bank yield index
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Floor			0.00%
Basis spread on variable rate			4.00%
Comerica Bank credit facility \| Line of credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity				60,000,000						60,000,000			60,000,000
Credit facility, available borrowing capacity				49,000,000						49,000,000			49,000,000
Comerica Bank credit facility \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit committed				11,000,000						11,000,000			11,000,000
Comerica Bank credit facility \| Letter of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity			$ 11,500,000														$ 7,500,000
Comerica Bank credit facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Debt Covenant, Consent for Common Stock Repurchases, Amount				1,000,000						1,000,000			1,000,000
Jones Crossing loan
Debt Instrument [Line Items]
Debt				24,118,000						24,118,000			24,118,000					24,042,000
The Annie B land loan
Debt Instrument [Line Items]
Debt				13,939,000						13,939,000			13,939,000					13,847,000
New Caney land loan
Debt Instrument [Line Items]
Debt				4,043,000						4,043,000			$ 4,043,000					4,496,000
New Caney land loan \| Land Loan Payable
Debt Instrument [Line Items]
Repayments of Debt				200,000				$ 200,000
New Caney land loan \| Land Loan Payable \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate													3.00%
Paycheck Protection Program loan
Debt Instrument [Line Items]
Debt				0						0			$ 0					156,000
Net gain on extinguishment of debt									$ 3,700,000
Kingwood Place
Debt Instrument [Line Items]
Debt				32,657,000						32,657,000			32,657,000					32,249,000
Lantana Place
Debt Instrument [Line Items]
Debt				21,776,000						21,776,000			21,776,000					22,098,000
Magnolia Place Construction Loan [Member]
Debt Instrument [Line Items]
Debt				6,314,000						6,314,000			6,314,000					2,077,000
West Killeen Market
Debt Instrument [Line Items]
Debt				5,979,000						5,979,000			5,979,000					6,078,000
West Killeen Market \| Construction Loan Payable \| Southside Bank
Debt Instrument [Line Items]
Debt principal		$ 6,000,000					$ 6,000,000
West Killeen Market \| Construction Loan Payable \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Floor		3.00%
Basis spread on variable rate		2.75%
Amarra Villas credit facility
Debt Instrument [Line Items]
Debt				5,574,000						5,574,000			5,574,000					1,605,000
Amarra Villas credit facility \| Line of credit
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity															$ 18,000,000	$ 15,000,000
Amarra Villas credit facility \| Line of credit \| Bloomberg short-term bank yield index
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Floor							0.00%
Basis spread on variable rate							3.00%
The Saint June
Debt Instrument [Line Items]
Debt				$ 9,770,000						$ 9,770,000			$ 9,770,000					$ 0
Saint George Apartments Loan \| Comercia Bank
Debt Instrument [Line Items]
Interest Rate, Stated Percentage						6.50%
Debt Instrument, Payment Guaranty, Percentage						25.00%
Debt Instrument, Covenant, Debt Service Coverage Ratio						1.20
Debt Instrument, Covenant, Loan to Value Ratio						0.65
Debt Covenant, net asset value						$ 125,000,000
Saint George Apartments Loan \| Comercia Bank \| Saint George L.P.
Debt Instrument [Line Items]
Debt principal						$ 56,800,000
Saint George Apartments Loan \| Bloomberg short-term bank yield index \| Comercia Bank
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Floor						0.00%
Basis spread on variable rate						2.35%
Southside Bank \| Construction Loan Payable \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Floor					3.00%
Basis spread on variable rate					2.40%
Debt Instrument, Covenant, Debt Service Coverage Ratio					1.25