Investments in Joint Ventures - Investments in unconsolidated joint ventures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Total Investment	$ 161,391		$ 161,391
Total Assets of The Partnership	711,856		711,856		$ 709,166
Net income	2,059	$ 492	3,394	$ 898
The Company's Share of Profit (Loss) of the Partnership	(2,724)	$ (4,047)	(5,743)	$ (7,672)
Total Assets of The Partnership
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	531,046		531,046
Net income			(8,957)
Brooksville Quarry, LLC
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	14,548		14,548		14,439
Net income			(44)
BC FRP Realty, LLC
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	22,708		22,708		22,454
Net income			(130)
Buzzard Point Sponsor, LLC
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	4,804		4,804		4,652
Net income			0
Bryant Street Partnerships
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	201,139		201,139		202,634
Net income			(4,594)
Lending ventures
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	15,647		15,647		17,117
Net income			0
BBX Partnerships
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	4,598		4,598
Net income			0
Estero Partnership
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	38,520		38,520		38,652
Net income			0
The Verge Partnership
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	128,752		128,752		130,173
Net income			(2,797)
Greenville Partnerships
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	$ 100,330		100,330		$ 98,223
Net income			(1,392)
The Company's Share of Profit (Loss) of the Partnership
Schedule of Equity Method Investments [Line Items]
The Company's Share of Profit (Loss) of the Partnership			$ (5,743)
Brooksville Quarry, LLC
Schedule of Equity Method Investments [Line Items]
Common Ownership	50.00%		50.00%
Total Investment	$ 7,528		$ 7,528
The Company's Share of Profit (Loss) of the Partnership			$ (22)
BC FRP Realty, LLC
Schedule of Equity Method Investments [Line Items]
Common Ownership	50.00%		50.00%
Total Investment	$ 5,783		$ 5,783
The Company's Share of Profit (Loss) of the Partnership			$ (65)
Buzzard Point Sponsor, LLC
Schedule of Equity Method Investments [Line Items]
Common Ownership	50.00%		50.00%
Total Investment	$ 2,402		$ 2,402
The Company's Share of Profit (Loss) of the Partnership			$ 0
Bryant Street Partnerships
Schedule of Equity Method Investments [Line Items]
Common Ownership	72.10%		72.10%		61.36%
Total Investment	$ 68,334		$ 68,334
The Company's Share of Profit (Loss) of the Partnership			(3,382)
Lending ventures
Schedule of Equity Method Investments [Line Items]
Total Investment	$ 26,273		26,273
The Company's Share of Profit (Loss) of the Partnership			$ 0
BBX Partnerships
Schedule of Equity Method Investments [Line Items]
Common Ownership	50.00%		50.00%
Total Investment	$ 2,304		$ 2,304
The Company's Share of Profit (Loss) of the Partnership			$ 0
Estero Partnership
Schedule of Equity Method Investments [Line Items]
Common Ownership	16.00%		16.00%
Total Investment	$ 3,655		$ 3,655
The Company's Share of Profit (Loss) of the Partnership			$ 0
The Verge Partnership
Schedule of Equity Method Investments [Line Items]
Common Ownership	61.37%		61.37%
Total Investment	$ 38,568		$ 38,568
The Company's Share of Profit (Loss) of the Partnership			$ (1,717)
Greenville Partnerships
Schedule of Equity Method Investments [Line Items]
Common Ownership	40.00%		40.00%
Total Investment	$ 6,544		$ 6,544
The Company's Share of Profit (Loss) of the Partnership			$ (557)