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Investments in Joint Ventures (Details Narrative) $ in Thousands	1 Months Ended	3 Months Ended					9 Months Ended
	May 31, 2016 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2006 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 a ft²	Oct. 04, 2006 a
Company's share of the loss of the joint venture		$ 12	$ 1,119	$ 652			$ 1,589	$ 924
Joint Venture consolidated retained earnings		$ (2,633)	$ (1,667)				$ (2,633)
Vulcan
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
Acres conributed | a									10
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			$ 4				$ 31
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%
Distribution received	$ 2,130
Acres conributed | a									25
Company's share of the loss of the joint venture			$ 0				$ 0

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