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Debt (Details) - USD ($)	1 Months Ended						3 Months Ended						9 Months Ended		19 Months Ended
	Oct. 31, 2025	Sep. 30, 2025	Aug. 12, 2025	May 31, 2025	Feb. 28, 2025	Oct. 31, 2024	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Jan. 31, 2025	Dec. 31, 2024	Nov. 09, 2023	May 01, 2023
Debt Instrument [Line Items]
Debt		$ 203,898,000					$ 203,898,000						$ 203,898,000				$ 194,853,000
Unamortized debt issuance costs		1,800,000					1,800,000						1,800,000				1,800,000
Interest costs incurred							3,800,000			$ 4,000,000.0			11,500,000	$ 11,900,000
Common Stock, Dividends, Per Share, Declared												$ 4.67
Dividends, Common Stock, Cash												$ 40,000,000
Dividends Payable		18,000					18,000						18,000				300,000
Share Repurchase Program, Authorized, Amount		25,000,000.0					25,000,000.0						$ 25,000,000.0					$ 5,000,000
Stock Repurchased During Period, Shares													100,967		180,899
Stock Repurchased During Period, Value							1,447,000	$ 116,000	$ 410,000		$ 22,000		$ 2,000,000.0		$ 3,900,000
Treasury Stock Acquired, Average Cost Per Share													$ 19.50		$ 21.59
Share Repurchase Program, Remaining Authorized, Amount		21,100,000					21,100,000						$ 21,100,000
Noncontrolling interest distributions								$ (856,000)
Interest Costs Capitalized							(3,100,000)						$ (10,400,000)
Noncontrolling Interest [Member]
Debt Instrument [Line Items]
Noncontrolling interest distributions									$ (856,000)
Saint June, L.P. | Stratus Properties Inc
Debt Instrument [Line Items]
Basis spread on variable rate													5.00%
Saint June, L.P. | Stratus Properties Inc | Subsequent event
Debt Instrument [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	$ 225,000
Saint June, L.P. | Unrelated Equity Investor | Subsequent event
Debt Instrument [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	435,000
Comerica Bank revolving credit facility a
Debt Instrument [Line Items]
Debt		0					0						$ 0				0
Comerica Bank revolving credit facility a | Letter of Credit
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity																$ 15,600,000			$ 13,300,000
Letters of credit committed		11,600,000					11,600,000						11,600,000
Line of Credit Facility, Increase (Decrease), Other, Net				$ 4,000,000.0	$ 2,300,000
Comerica Bank revolving credit facility a | Letter of Credit | Lakeway
Debt Instrument [Line Items]
Letters of credit committed		2,300,000					2,300,000						2,300,000
Comerica Bank revolving credit facility a | Letter of Credit | Holden Hills
Debt Instrument [Line Items]
Letters of credit committed		9,000,000.0					9,000,000.0						9,000,000.0
Comerica Bank revolving credit facility a | Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		55,000,000.0					55,000,000.0						55,000,000.0
Credit facility, available borrowing capacity		17,500,000					17,500,000						17,500,000
Debt Instrument, Debt Covenant, Consent for Common Stock Repurchases, Amount		1,000,000					1,000,000						1,000,000
Line of Credit Facility, Current Borrowing Capacity		29,100,000					$ 29,100,000						$ 29,100,000
Line of Credit Facility, Borrowing Capacity, Description													In June 2025, the Holden Hills Phase 2 property was removed from the borrowing base for the revolving credit facility, in anticipation of a potential separate revolving credit facility for the property, and the maximum amount that could be borrowed was reduced. Also, in June 2025, after the Amarra Villas credit facility was fully repaid and terminated, the remaining three Amarra Villas homes were added to the borrowing base for the Comerica Bank revolving credit facility. The net effect of these changes was a decrease of $24.8 million to the maximum amount that could be borrowed at that time
Line of Credit Facility, Increase (Decrease), Net													$ 24,800,000
Comerica Bank revolving credit facility a | Revolving Credit Facility | Subsequent event
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 35,000,000.0
Comerica Bank revolving credit facility a | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate							3.00%
Comerica Bank revolving credit facility a | Revolving Credit Facility | One-Month SOFR
Debt Instrument [Line Items]
Basis spread on variable rate							0.10%
Debt Instrument, Interest Rate Floor							(0.50%)
Kingwood Place Loan
Debt Instrument [Line Items]
Debt		32,550,000					$ 32,550,000						32,550,000				32,408,000
Lantana Place Loan
Debt Instrument [Line Items]
Debt		29,451,000					$ 29,451,000						29,451,000				25,509,000
Lantana Place Loan | Broadway National Bank
Debt Instrument [Line Items]
Debt Instrument, Covenant, Debt Service Coverage Ratio							1.30
Debt principal		29,800,000					$ 29,800,000						29,800,000
Lantana Place Loan | Broadway National Bank | Stratus Properties Inc
Debt Instrument [Line Items]
Proceeds from Issuance of Debt							$ 3,000,000.0
Lantana Place Loan | One-Month SOFR | Broadway National Bank
Debt Instrument [Line Items]
Basis spread on variable rate							2.35%
Debt Instrument, Interest Rate Floor							0.00%
Jones Crossing Loan
Debt Instrument [Line Items]
Debt		23,624,000					$ 23,624,000						23,624,000				22,428,000
Jones Crossing Loan | Brighthouse Life Insurance Company
Debt Instrument [Line Items]
Debt		24,000,000.0					24,000,000.0						24,000,000.0
Jones Crossing Loan | Brighthouse Life Insurance Company | Stratus Properties Inc
Debt Instrument [Line Items]
Proceeds from Issuance of Debt							$ 1,200,000
Jones Crossing Loan | One-Month SOFR | Brighthouse Life Insurance Company
Debt Instrument [Line Items]
Basis spread on variable rate							1.95%
Debt Instrument, Interest Rate Floor							(3.00%)
The Annie B land loan
Debt Instrument [Line Items]
Debt		11,876,000					$ 11,876,000						11,876,000				12,568,000
Debt Instrument, Periodic Payment, Principal			$ 49,875
Saint George construction loan
Debt Instrument [Line Items]
Debt		52,239,000					52,239,000						52,239,000				47,741,000
The Saint June
Debt Instrument [Line Items]
Debt		33,178,000					33,178,000						33,178,000				32,109,000
Proceeds from Issuance of Debt		1,300,000
Debt Instrument, Increase (Decrease), Net		1,500,000
Long-Term Construction Loan		$ 32,900,000					32,900,000						32,900,000
The Saint June | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		2.00%				2.35%
Debt Instrument, Interest Rate Floor						(3.50%)
Holden Hills Phase 1
Debt Instrument [Line Items]
Debt		$ 20,980,000					20,980,000						20,980,000				15,265,000
West Killeen Market
Debt Instrument [Line Items]
Debt		0					0						0				5,194,000
Amarra Villas credit facility
Debt Instrument [Line Items]
Debt		0					0						0				$ 1,631,000
Amarra Villas credit facility | Revolving Credit Facility
Debt Instrument [Line Items]
Debt		$ 1,700,000					$ 1,700,000						$ 1,700,000

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