No definition available.

Name:	frevsob_OrganizationandSignificantAccountingPoliciesDetailsLineItems
Namespace Prefix:	frevsob_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 720
-SubTopic 35
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483406/720-35-50-1

+ Details

Name:	us-gaap_AdvertisingExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1F
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1F

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482925/835-30-45-3

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(8))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

+ Details

Name:	us-gaap_AmortizationOfFinancingCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

+ Details

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of investment income (loss) to average net assets.

+ References

No definition available.

+ Details

Name:	us-gaap_InvestmentCompanyInvestmentIncomeLossRatio
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The percent of net assets of non investment assets and liabilities. This represents the percentage difference between the investments, including long and short positions, and net assets.

+ References

No definition available.

+ Details

Name:	us-gaap_NonInvestmentAssetsLessNonInvestmentLiabilitiesPercentOfNetAssets
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_OwnershipAxis=frevsob_FREITMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=frevsob_PierreTowersLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=frevsob_SAndACommercialAssociatesLimitedPartnershipMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=frevsob_TICAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Organization and Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2021	Feb. 28, 2020
Organization and Significant Accounting Policies (Details) [Line Items]
Investment trust, percentage	90.00%
Noncontrolling interests in subsidiaries, percentage	100.00%
Amortization costs, interest expense (in Dollars)	$ 509,000	$ 971,000	$ 1,109,000
Advertising costs (in Dollars)	$ 287,000	$ 234,000	$ 421,000
FREIT [Member]
Organization and Significant Accounting Policies (Details) [Line Items]
Ownership interest, percentage	40.00%
Pierre Towers, LLC [Member]
Organization and Significant Accounting Policies (Details) [Line Items]
Noncontrolling interests in subsidiaries, percentage				100.00%
Percentage of ownership interest	100.00%
Pierre Towers, LLC [Member] \| FREIT [Member]
Organization and Significant Accounting Policies (Details) [Line Items]
Percentage of ownership interest				100.00%
Pierre Towers, LLC [Member] \| S And A Commercial Associates Limited Partnership [Member]
Organization and Significant Accounting Policies (Details) [Line Items]
Percentage of ownership interest				65.00%
TIC Agreement [Member]
Organization and Significant Accounting Policies (Details) [Line Items]
Percentage of ownership interest	65.00%
TIC Agreement [Member] \| FREIT [Member]
Organization and Significant Accounting Policies (Details) [Line Items]
Percentage of ownership interest				65.00%