Investments in Joint Ventures as of December 31, 2023 (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	$ 500,235	$ 493,324
Cash and restricted cash	14,149	7,937
Unrealized rents & receivables	7,731	5,577
Deferred costs	6,229	3,802
Total Assets	709,166	701,084	$ 678,190
Secured notes payable	263,717	276,801
Other liabilities	8,742	11,023
Capital - Third Parties	414,520	407,145
Total Liabilities and Capital	709,166	701,084
Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	528,344	510,640
Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	160,776	135,333
Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	95,109	87,483
Real Estate Partnership Total Liabilities And Capital [Member]
Schedule of Equity Method Investments [Line Items]
Total Liabilities and Capital	528,344	510,640
Brooksville Quarry L L C [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	14,358	14,307
Cash and restricted cash	80	66
Unrealized rents & receivables	0	0
Deferred costs	1	1
Secured notes payable	0	0
Other liabilities	0	0
Brooksville Quarry L L C [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	14,439	14,374
Brooksville Quarry L L C [Member] | Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	7,552	7,522
Brooksville Quarry L L C [Member] | Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	6,887	6,852
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	14,439	14,374
B C F R P Realty L L C [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	21,503	21,059
Cash and restricted cash	127	99
Unrealized rents & receivables	464	422
Deferred costs	360	245
Secured notes payable	12,086	10,899
Other liabilities	402	338
B C F R P Realty L L C [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	22,454	21,825
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	4,983	5,294
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	4,983	5,294
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	22,454	21,825
Lending Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	17,117	5,547
Cash and restricted cash	0	0
Unrealized rents & receivables	0	0
Deferred costs	0	30
Secured notes payable	(10,578)	(10,899)
Other liabilities	0	0
Lending Ventures [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	17,117	5,577
Lending Ventures [Member] | Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	27,695	16,476
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	17,117	5,577
Multifamily J V [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	447,257	452,411
Cash and restricted cash	13,942	7,772
Unrealized rents & receivables	7,267	5,155
Deferred costs	5,868	3,526
Secured notes payable	262,209	276,801
Other liabilities	8,340	10,685
Multifamily J V [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	474,334	468,864
Multifamily J V [Member] | Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	120,546	106,041
Multifamily J V [Member] | Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	83,239	75,337
Multifamily J V [Member] | Real Estate Partnership Total Liabilities And Capital [Member]
Schedule of Equity Method Investments [Line Items]
Total Liabilities and Capital	$ 474,334	$ 468,864