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Investments in Joint Ventures (Details Narrative) $ in Thousands	1 Months Ended	3 Months Ended			6 Months Ended			12 Months Ended
	May 31, 2016 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2006 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($) a ft²	Dec. 31, 2017 USD ($)	May 04, 2018	Sep. 28, 2017 USD ($)	Oct. 04, 2006 a
Company's share of the loss of the joint venture		$ 11	$ 806		$ 23	$ 1,577
Joint Venture consolidated retained earnings		(2,655)			(2,655)			$ (2,638)
Outstanding balance		$ 0			0			$ 29,664
Cash contribution					$ 4,671	$ 236
Construction loan description								5.6% to 8% mortgage notes due in installments through 2027
Eagle BankRiverFront Holdings II, OOC
Interest rate over LIBOR					3.25%
Construction loan description					.Â The loan from Eagle Bank allows draws of up to $71 million during construction at an interest rate of 3.25% over libor. The loan is interest only and matures in 36 months with a 12 month extension assuming completion of construction and at least one occupancy.Â There is a provision for an additional 72 months extension with a 30 year amortization of principal at 2.15% over 7 year US Treasury Constant if NOI is sufficient for a 9% yield.
Vulcan
Joint venture percentage stake											50.00%
Acres conributed \| a											553
Vulcan leasehold interest \| a											3,443
FRP additional contribution for land				$ 3,018
Additional land acquired \| a											288
St Johns Properties JV St Johns
Value of land contributed							$ 3,240
Joint venture percentage stake							50.00%
Acres conributed \| a							10
MRP
Joint venture percentage stake									510000.00%
Development fee					$ 750
Brooksville Quarry, LLC
Land acreage \| a											4,300
Joint venture percentage stake		50.00%			50.00%			50.00%			50.00%
Acres conributed \| a											3,443
Book value of land contribution				2,548
FRP additional contribution for land				$ 3,018
Additional land acquired \| a											288
Company's share of the loss of the joint venture					$ 23			$ 40
BC FRP Realty, LLC
Square feet \| ft²							329,000
Value of land contributed							$ 7,500
Joint venture percentage stake		50.00%			50.00%		50.00%	50.00%
Distribution received	$ 2,130
Acres conributed \| a							25
Company's share of the loss of the joint venture					$ 0			$ 0
Construction financing through September 15, 2022										$ 17,250
Construction financing through September 15, 2018										$ 330
Interest rate over LIBOR					2.50%
Outstanding balance		$ 5,869			$ 5,869
RiverFront Holdings II, LLC
Value of land contributed					$ 16,300
Joint venture percentage stake		80.00%			80.00%
Book value of land contribution					$ 4,600
Company's share of the loss of the joint venture					0
Cash contribution					$ 4,600