Investments in Joint Ventures as of December 31, 2023 (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	$ 508,350	$ 500,235
Cash and restricted cash	11,472	14,149
Unrealized rents & receivables	7,385	7,731
Deferred costs	5,983	6,229
Total Assets	705,673	709,166
Secured notes payable	279,326	263,717
Other liabilities	4,058	8,742
Capital - Third Parties	416,133	414,520
Total Liabilities and Capital	705,673	709,166
Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	533,190	528,344
Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	158,953	160,776
Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	90,853	95,109
Real Estate Partnership Total Liabilities And Capital [Member]
Schedule of Equity Method Investments [Line Items]
Total Liabilities and Capital	533,190	528,344
Brooksville Quarry L L C [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	14,357	14,358
Cash and restricted cash	72	80
Unrealized rents & receivables	0	0
Deferred costs	7	1
Secured notes payable	0	0
Other liabilities	22	0
Brooksville Quarry L L C [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	14,436	14,439
Brooksville Quarry L L C [Member] | Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	7,539	7,552
Brooksville Quarry L L C [Member] | Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	6,875	6,887
Brooksville Quarry L L C [Member] | Real Estate Partnership Total Liabilities And Capital [Member]
Schedule of Equity Method Investments [Line Items]
Total Liabilities and Capital	14,436	14,439
B C F R P Realty L L C [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	21,761	21,503
Cash and restricted cash	193	127
Unrealized rents & receivables	448	464
Deferred costs	248	360
Secured notes payable	10,782	12,086
Other liabilities	356	402
B C F R P Realty L L C [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	22,650	22,454
B C F R P Realty L L C [Member] | Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	5,756	4,983
B C F R P Realty L L C [Member] | Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	5,756	4,983
B C F R P Realty L L C [Member] | Real Estate Partnership Total Liabilities And Capital [Member]
Schedule of Equity Method Investments [Line Items]
Total Liabilities and Capital	22,650	22,454
Lending Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	19,431	17,117
Cash and restricted cash	0	0
Unrealized rents & receivables	0	0
Deferred costs	0	0
Secured notes payable	(10,740)	(10,578)
Other liabilities	0	0
Lending Ventures [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	19,431	17,117
Lending Ventures [Member] | Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	30,171	27,695
Lending Ventures [Member] | Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	0	0
Lending Ventures [Member] | Real Estate Partnership Total Liabilities And Capital [Member]
Schedule of Equity Method Investments [Line Items]
Total Liabilities and Capital	19,431	17,117
Multifamily J V [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	449,545	447,257
Cash and restricted cash	11,207	13,942
Unrealized rents & receivables	6,937	7,267
Deferred costs	5,728	5,868
Secured notes payable	279,284	262,209
Other liabilities	3,680	8,340
Multifamily J V [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	473,417	474,334
Multifamily J V [Member] | Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	113,859	120,546
Multifamily J V [Member] | Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	76,594	83,239
Multifamily J V [Member] | Real Estate Partnership Total Liabilities And Capital [Member]
Schedule of Equity Method Investments [Line Items]
Total Liabilities and Capital	$ 473,417	$ 474,334