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Contingent Liabilities (Details Narrative) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Jun. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Contingent Liabilities Details Narrative Abstract |  |  |  |
Environmental remediation expense (recovery) | $ (465) | $ 2,000 | $ (465) | $ 0

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- References No definition available. + Details
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Namespace Prefix: | FRPH_
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Period Type: | duration

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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109237650&loc=d3e13064-110858 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
Name: | us-gaap_EnvironmentalRemediationExpense
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Balance Type: | debit
Period Type: | duration