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Area of land held.

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Area of a real estate property.

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Value of property contributed in noncash investing and financing activities.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments including both interest and principal payments.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Interest rate on outstanding borrowings under debtor-in-possession financing arrangement.

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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Describes how and under what circumstances or in connection with which transaction the guarantee or each group of similar guarantees was given and the objective of the guarantee.

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Describe the approximate term of the guarantee or each group of similar guarantees.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Rate of interest on investment.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Description of long-term debt arrangements, which are debt arrangements that originally require full repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer, and disclosures pertaining to the underlying arrangements, including repayment terms, conversion features, interest rates, restrictions on assets and activities, debt covenants, and other matters important to users of the financial statements. Types of long-term debt arrangements include borrowing under notes payable, bonds payable, debentures, term loans, and other contractual obligations for payment.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The number of units in a real estate property owned as of the balance sheet date.

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No definition available.

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner.

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Amount of consolidated retained earnings that represent undistributed (not yet received) earnings from 50% or less owned persons accounted for by the equity method (equity method investees).

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Investments in Joint Ventures (Details Narrative) $ in Thousands	1 Months Ended							3 Months Ended					12 Months Ended
	Jun. 30, 2020	May 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Feb. 28, 2020	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) integer	May 31, 2016 USD ($)	Mar. 31, 2021 USD ($) integer	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2006 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017	Dec. 31, 2016 USD ($)	Jun. 26, 2020 USD ($)	Apr. 28, 2020 USD ($)	Feb. 14, 2020 USD ($)	Dec. 23, 2019 a integer	Dec. 20, 2019 a integer	Jul. 31, 2019 USD ($) a ft² integer	Jun. 26, 2019 USD ($) integer	Mar. 13, 2019 USD ($)	Dec. 24, 2018 a	May 04, 2018 ft² integer	Jan. 27, 2018 USD ($)	Sep. 28, 2017 USD ($) integer	Apr. 26, 2016 a ft²	Oct. 04, 2006 a
Company's share of the loss of the joint venture								$ 1,635		$ 642			$ 5,690
Joint Venture consolidated retained earnings (accumulated deficit)								(5,937)					$ (8,278)
Cash contribution								1,918		$ 3,600
Difference between capital recorded by the Company and the joint ventures								3,927
1800 Half Street
Square feet \| a																						11,246
Cash contribution					$ 37,300
No. of homes \| integer																						344
408 Jackson
Square feet \| a																					4,700
Joint venture percentage stake																					40.00%
Cash contribution					9,700
No. of homes \| integer																					227
Greenville
Joint venture percentage stake																					40.00%
Cash contribution					6,200
No. of homes \| integer																					200
Bryant Street and MRP
Loan description														The loan matures March 13, 2023 with up to two extension of one year each upon certain conditions.
Loan guarantee amount					$ 26,000									$ 26,000
Loan guarantee term														48 months
Loan guarantee description														The Company and MRP have a side agreement limiting the Company's guarantee to its proportionate ownership. The value of the guarantee was calculated at $1.9 million based on the present value of the 1% interest savings over the anticipated 48-month term.
Loan guarantee interest savings					1.00%									1.00%
Loan guarantee present value					$ 1,900									$ 1,900
BC FRP Realty, LLC Debt
Construction financing																													$ 17,250
Interest rate over DAILY 1 MONTH LIBOR																2.50%
Outstanding balance								11,969
Buildings \| integer																													4
Bryant Street Partnerships Construction Loan
Interest rate over DAILY 1 MONTH LIBOR														2.25%
Outstanding balance								95,967
Loan commitment																									$ 132,000
Bryant Street Partnerships Construction Loan Extension 1
Debt service coverage																									1.1
Loan-to-value																									65.00%
Bryant Street Partnerships Construction Loan Extension 2
Debt service coverage																									1.25
Loan-to-value																									65.00%
1800 Half Street Construction loan
Construction financing																		$ 74,000
Interest rate over DAILY 1 MONTH LIBOR	2.25%
1800 Half Street Construction loan extension
Loan extension fee																		0.25%
Debt Yield for extension	9.90%
Amortization schedule	30 years
408 Jackson Construction Loan
Construction financing																			$ 36,000
Interest rate over DAILY 1 MONTH LIBOR			2.00%
Outstanding balance								1,857
Interest only period			4 years
Principal and interest payment			$ 18
Principal payments in year five																			$ 18
408 Jackson Construction Loan extension
Debt service coverage																			1.2
Loan-to-value																			60.00%
Loan extension fee																			0.10%
Greenville Construction Loan
Construction financing																				$ 22,800
Interest rate over DAILY 1 MONTH LIBOR				2.25%
Outstanding balance								$ 8,307
Financing term				4 years
Interest rate reduction after certificate of occupancy																				2.05%
Greenville Construction Loan extension
Debt service coverage																				1.25
Amortization schedule				30 years
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
DST CS1031 Hickory Creek
Square feet \| ft²																							273,940
Land acreage \| a																							20.4
No. Single family homes \| integer																							294
Buildings \| integer																							19
Interest rate																							3.74%
Financing term											10 years
Amortization period											30 years
Financing obtained																							$ 29,672
Interest only period											5 years
Property value																							$ 45,600
Brooksville Quarry, LLC
Land acreage \| a																															4,300
Joint venture percentage stake								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								$ 11					$ 39
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								$ 26					$ 207
Hyde Park
Company's share of the loss of the joint venture								$ 0					$ 0
Loan commitment																												$ 3,500
Interest rate																												10.00%
Preferred return																												20.00%
No. of homes \| integer								126
Principal and interest payment		$ 2,670							$ 1,130
Bryant Street Partnerships
Number of partnerships \| integer						4
Land acreage \| a																										5
Joint venture percentage stake								61.36%					61.36%													61.36%
Company's share of the loss of the joint venture								$ 1,061					$ 2,130
Cash contribution						$ 32,000
Preferred equity financing						$ 23,000
Preferred equity financing interest rate																										8.00%
Company's share of preferred interest								234					1,146
Amortization of guarantee liability								$ 118					$ 471
DST Hickory Creek
Joint venture percentage stake								26.65%					26.65%										26.65%
Distribution received								$ 84
Company's share of the loss of the joint venture								(84)					$ (339)
Cash contribution											$ 6,000
Amber Ridge
Company's share of the loss of the joint venture								$ 0					$ 0
Loan commitment																								$ 18,500
Interest rate																								10.00%
Preferred return																								20.00%
No. of homes \| integer																								187
RiverFront Holdings II, LLC
Square feet \| ft²																											250,000
Value of land contributed															$ 16,300
Joint venture percentage stake								72.00%					80.00%														80.00%
Book value of land contribution															4,600
Company's share of the loss of the joint venture								$ 639					$ 3,907
Cash contribution															6,200
No. of homes \| integer																											264
Preferred equity financing															$ 13,750
Preferred equity financing interest rate																											7.50%
Company's share of preferred interest													$ 286