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Income Taxes - Schedule Of NOL Carryovers (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Income Tax Disclosure [Abstract] |  |
State NOL Carryovers | $ 16,002 | $ 49,278
Federal NOL Carryovers | $ 0 | $ 28,637

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- Definition Federal NOL Carryovers + References No definition available. + Details
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Namespace Prefix: | frph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition State NOL Carryovers + References No definition available. + Details
Name: | frph_StateNOLCarryovers
Namespace Prefix: | frph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration