Investments in unconsolidated joint ventures (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Total investments	$ 144,677		$ 140,525
Total assets of the partnership	699,599		701,084
Profit (loss) of the partnership	406	$ 404
Share of profit (loss) of the partnership	(3,625)	$ (1,604)
Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership	516,055		510,640
Profit (loss) of the partnership	(6,085)		(3,437)
Real Estate Partnership Net Income Loss [Member]
Schedule of Equity Method Investments [Line Items]
Share of profit (loss) of the partnership	$ (3,625)		$ (5,721)
Brooksville Quarry L L C [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Total investments	$ 7,509		$ 7,522
Profit (loss) of the partnership	(24)		(84)
Share of profit (loss) of the partnership	(12)		(42)
Brooksville Quarry L L C [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership	$ 14,371		$ 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%
Total investments	$ 5,462		$ 5,453
Profit (loss) of the partnership	(182)		(358)
Share of profit (loss) of the partnership	(91)		(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	$ 21,801		$ 21,825
Buzzard Point Sponsor Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Total investments	$ 1,889		$ 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	$ 3,778		$ 2,906
Bryant Street Partnerships [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	61.36%		61.36%
Total investments	$ 54,961		$ 55,561
Profit (loss) of the partnership	(2,295)		(10,339)
Share of profit (loss) of the partnership	(1,506)		(6,829)
Bryant Street Partnerships [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership	198,741		199,774
Lending Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Total investments	19,652		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	$ 9,011		$ 5,577
Estero Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	16.00%		16.00%
Total investments	$ 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	$ 38,500		$ 38,505
Half St Owner L L C [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	61.37%		61.37%
Total investments	$ 40,256		$ 38,471
Profit (loss) of the partnership	(2,727)		(1,841)
Share of profit (loss) of the partnership	(1,673)		(1,129)
Half St Owner L L C [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership	$ 134,060		$ 131,128
Greenville Partnerships [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	40.00%		40.00%
Total investments	$ 11,348		$ 11,989
Profit (loss) of the partnership	(857)		(1,775)
Share of profit (loss) of the partnership	(343)		(710)
Greenville Partnerships [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of the partnership	$ 95,793		$ 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