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Leases - Schedule of Carrying Value of Property (Details) $ in Thousands | Dec. 31, 2024 USD ($)
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Leases [Abstract] |
Construction aggregates property | $ 46,950
Commercial property | 121,391
Residential/mixed-use property | 327,117
Carrying value of property owned by the company leased or held for lease, gross | 495,458
Less accumulated depreciation and depletion | 77,015
Carrying value of property owned by the company leased or held for lease, net | $ 418,443

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- Definition Accumulated Depreciation and Depletion of leased real estate + References No definition available. + Details
Name: | frph_AccumulatedDepreciationDepletionRealEstateLeased
Namespace Prefix: | frph_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commercial Property + References No definition available. + Details
Name: | frph_CommercialProperty
Namespace Prefix: | frph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Construction aggregates property + References No definition available. + Details
Name: | frph_ConstructionAggregatesProperty
Namespace Prefix: | frph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Carrying Value of property owned by the Company leased or held for lease, gross + References No definition available. + Details
Name: | frph_RealEstateLeasedCarryingValueGross
Namespace Prefix: | frph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Carrying Value of property owned by the Company leased or held for lease, net + References No definition available. + Details
Name: | frph_RealEstateLeasedCarryingValueNet
Namespace Prefix: | frph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Residential/mixed-use property + References No definition available. + Details
Name: | frph_ResidentialMixedUseProperty
Namespace Prefix: | frph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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