Investments in unconsolidated joint ventures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Total investments	$ 154,025		$ 154,025		$ 140,525
Total assets of the partnership	701,157		701,157		701,084
Profit (loss) of the partnership	1,099	$ 384	1,997	$ 1,370
Share of profit (loss) of the partnership	(2,913)	$ (1,878)	(10,585)	$ (5,248)
Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership	$ 519,761		519,761		510,640
Profit (loss) of the partnership			(18,031)		(3,437)
Real Estate Partnership Net Income Loss [Member]
Schedule of Equity Method Investments [Line Items]
Share of profit (loss) of the partnership			$ (10,585)		$ (5,721)
Brooksville Quarry L L C [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%		50.00%		50.00%
Total investments	$ 7,486		$ 7,486		$ 7,522
Profit (loss) of the partnership			(62)		(84)
Share of profit (loss) of the partnership			(31)		(42)
Brooksville Quarry L L C [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership	$ 14,372		$ 14,372		$ 14,374
B C F R P Realty L L C [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%		50.00%		50.00%
Total investments	$ 5,077		$ 5,077		$ 5,453
Profit (loss) of the partnership			(556)		(358)
Share of profit (loss) of the partnership			(278)		(175)
B C F R P Realty L L C [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership	$ 22,164		$ 22,164		$ 21,825
Buzzard Point Sponsor Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%		50.00%		50.00%
Total investments	$ 2,292		$ 2,292		$ 1,453
Profit (loss) of the partnership			0		0
Share of profit (loss) of the partnership			0		0
Buzzard Point Sponsor Partnership [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership	$ 4,584		$ 4,584		$ 2,906
Bryant Street Partnerships [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	61.36%		61.36%		61.36%
Total investments	$ 61,140		$ 61,140		$ 55,561
Profit (loss) of the partnership			(7,876)		(10,339)
Share of profit (loss) of the partnership			(4,931)		(6,829)
Bryant Street Partnerships [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership	195,915		195,915		199,774
Lending Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Total investments	25,084		25,084		16,476
Profit (loss) of the partnership			0		0
Share of profit (loss) of the partnership			0		0
Lending Ventures [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership	$ 14,428		$ 14,428		$ 5,577
Estero Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	16.00%		16.00%		16.00%
Total investments	$ 3,600		$ 3,600		$ 3,600
Profit (loss) of the partnership			0		0
Estero Partnership [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership	$ 38,703		$ 38,703		$ 38,505
Verge [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	61.37%		61.37%		61.37%
Total investments	$ 37,535		$ 37,535		$ 38,471
Profit (loss) of the partnership			(7,161)		(1,841)
Share of profit (loss) of the partnership			(4,395)		(1,129)
Verge [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership	$ 130,978		$ 130,978		$ 131,128
Greenville Partnerships [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	40.00%		40.00%		40.00%
Total investments	$ 11,811		$ 11,811		$ 11,989
Profit (loss) of the partnership			(2,376)		(1,775)
Share of profit (loss) of the partnership			(950)		(710)
Greenville Partnerships [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership	$ 98,617		$ 98,617		$ 96,551
D S T Hickory Creek [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage					26.65%
Total investments					$ 0
Profit (loss) of the partnership					10,960
Share of profit (loss) of the partnership					3,164
D S T Hickory Creek [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership					$ 0