Investments in Joint Ventures as of December 31, 2022 (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	$ 495,278	$ 493,324
Cash and cash equivalents	10,337	7,937
Unrealized rents & receivables	5,756	5,577
Deferred costs	4,684	3,802
Total Assets	699,599	701,084
Secured notes payable	283,771	276,801
Other liabilities	5,907	11,023
Capital - Third Parties	409,211	407,145
Total Liabilities and Capital	699,599	701,084
Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	516,055	510,640
Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	139,459	135,333
Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	86,918	87,483
Real Estate Partnership Total Liabilities And Capital [Member]
Schedule of Equity Method Investments [Line Items]
Total Liabilities and Capital	516,055	510,640
Brooksville Quarry L L C [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	14,335	14,307
Cash and cash equivalents	30	66
Unrealized rents & receivables	0	0
Deferred costs	6	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	14,371	14,374
Brooksville Quarry L L C [Member] | Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	7,509	7,522
Brooksville Quarry L L C [Member] | Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	6,840	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	14,371	14,374
B C F R P Realty L L C [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	20,940	21,059
Cash and cash equivalents	147	99
Unrealized rents & receivables	412	422
Deferred costs	302	245
Secured notes payable	10,839	10,899
Other liabilities	546	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	21,801	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	5,208	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	5,208	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	21,801	21,825
Lending Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	9,011	5,547
Cash and cash equivalents	0	0
Unrealized rents & receivables	0	0
Deferred costs	0	30
Secured notes payable	(10,839)	(10,899)
Other liabilities	0	0
Lending Ventures [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	9,011	5,577
Lending Ventures [Member] | Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	19,850	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	9,011	5,577
Apartment Mixed Use [Member]
Schedule of Equity Method Investments [Line Items]
Investments in real estate, net	450,992	452,411
Cash and cash equivalents	10,160	7,772
Unrealized rents & receivables	5,344	5,155
Deferred costs	4,376	3,526
Secured notes payable	283,771	276,801
Other liabilities	5,339	10,685
Apartment Mixed Use [Member] | Real Estate Total Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	470,872	468,864
Apartment Mixed Use [Member] | Real Estate Partnership F R P [Member]
Schedule of Equity Method Investments [Line Items]
Capital – FRP	106,892	106,041
Apartment Mixed Use [Member] | Real Estate Partnership Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
Capital - Third Parties	74,870	75,337
Apartment Mixed Use [Member] | Real Estate Partnership Total Liabilities And Capital [Member]
Schedule of Equity Method Investments [Line Items]
Total Liabilities and Capital	$ 470,872	$ 468,864