Investments in Joint Ventures as of December 31, 2022 (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	$ 493,324	$ 472,317
Cash and cash equivalents	7,937	2,987
Unrealized rents & receivables	5,577	4,342
Deferred costs	3,802	898
Total Assets	701,084	678,190	$ 536,360
Secured notes payable	276,801	222,635
Other liabilities	11,023	28,253
Capital - Third Parties	407,145	396,423
Total Liabilities and Capital	701,084	678,190
Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	510,640	480,544
Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	135,333	139,981
Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	87,483	89,675
Real Estate Partnership Total Liabilities And Capital [Member]
Schedule of Equity Method Investments [Line Items]
Total Liabilities and Capital	510,640	480,544
Brooksville Quarry L L C [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	14,307	14,281
Cash and cash equivalents	66	18
Unrealized rents & receivables	0	0
Deferred costs	1	2
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	14,374	14,301
Brooksville Quarry L L C [Member] | Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	7,522	7,488
Brooksville Quarry L L C [Member] | Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	6,852	6,813
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	14,374	14,301
B C F R P Realty L L C [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	21,059	21,561
Cash and cash equivalents	99	312
Unrealized rents & receivables	422	368
Deferred costs	245	229
Secured notes payable	10,899	11,384
Other liabilities	338	140
B C F R P Realty L L C [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	21,825	22,470
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	5,294	5,473
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	5,294	5,473
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	21,825	22,470
Lending Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	5,547
Cash and cash equivalents	0
Unrealized rents & receivables	0
Deferred costs	30
Secured notes payable	(10,899)
Other liabilities	0
Lending Ventures [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	5,577
Lending Ventures [Member] | Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	16,476
Lending Ventures [Member] | Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	0
Lending Ventures [Member] | Real Estate Partnership Total Liabilities And Capital [Member]
Schedule of Equity Method Investments [Line Items]
Total Liabilities and Capital	5,577
Apartment Mixed Use [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	452,411	424,495
Cash and cash equivalents	7,772	2,657
Unrealized rents & receivables	5,155	3,974
Deferred costs	3,526	667
Secured notes payable	276,801	211,251
Other liabilities	10,685	28,113
Apartment Mixed Use [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	468,864	431,793
Apartment Mixed Use [Member] | Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	106,041	115,040
Apartment Mixed Use [Member] | Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	75,337	77,389
Apartment Mixed Use [Member] | Real Estate Partnership Total Liabilities And Capital [Member]
Schedule of Equity Method Investments [Line Items]
Total Liabilities and Capital	$ 468,864	$ 431,793