Variable rate mortgage loan.

No definition available.

Name:	frevsob_VariableRateMortgageLoan
Namespace Prefix:	frevsob_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Variable rate mortgage loans and credit line.

+ References

No definition available.

+ Details

Name:	frevsob_VariableRateMortgageLoansAndCreditLine
Namespace Prefix:	frevsob_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

+ Details

Name:	us-gaap_DeferredFinanceCostsNoncurrentGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Mortgages payable and credit line (Schedule of Debt) (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Oct. 31, 2019	Jan. 08, 2018
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 1,810	$ 2,886
Total mortgages, notes payable and credit line	307,240	352,790
Mortgages [Member]
Debt Instrument [Line Items]
Fixed rate mortgage loans	141,945	212,070
Unamortized debt issuance costs	1,190	2,006
Variable rate mortgage loan	165,295	140,720
Mortgages [Member] \| Rockaway, NJ Mortgage [Member]
Debt Instrument [Line Items]
Fixed rate mortgage loans	15,050	15,615
Unamortized debt issuance costs	23	51
Mortgages [Member] \| Westwood, NJ #2 [Member]
Debt Instrument [Line Items]
Fixed rate mortgage loans	18,695	18,973
Unamortized debt issuance costs	71	103
Mortgages [Member] \| Wayne, NJ Mortgage [Member] \| Berdan Court, LLC [Member]
Debt Instrument [Line Items]
Fixed rate mortgage loans	28,815	28,815
Unamortized debt issuance costs	427	475
Mortgages [Member] \| River Edge, NJ First Mortgage [Member]
Debt Instrument [Line Items]
Fixed rate mortgage loans	9,789	10,021
Unamortized debt issuance costs	53	70
Mortgages [Member] \| Red Bank, NJ Mortgage [Member]
Debt Instrument [Line Items]
Fixed rate mortgage loans	12,181	12,350
Unamortized debt issuance costs	108	123
Mortgages [Member] \| Westwood, NJ #3 [Member]
Debt Instrument [Line Items]
Fixed rate mortgage loans		19,617
Unamortized debt issuance costs		34
Mortgages [Member] \| Wayne, PSC LLC [Member]
Debt Instrument [Line Items]
Fixed rate mortgage loans	23,336	23,737
Unamortized debt issuance costs	205	240
Mortgages [Member] \| Hackensack, NJ [Member] \| Pierre Towers, LLC [Member]
Debt Instrument [Line Items]
Fixed rate mortgage loans		48,000	$ 29,100
Unamortized debt issuance costs		509
Mortgages [Member] \| Damascus, MD [Member]
Debt Instrument [Line Items]
Fixed rate mortgage loans	18,824	19,354
Unamortized debt issuance costs	166	231
Mortgages [Member] \| Middletown, NY Mortgage [Member]
Debt Instrument [Line Items]
Fixed rate mortgage loans	15,255	15,588
Unamortized debt issuance costs	137	170
Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	620	880
Variable rate mortgage loans and credit line	165,295	140,720
Notes Payable, Other Payables [Member] \| Frederick, MD [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs		28
Variable rate mortgage loan	21,775	22,200
Notes Payable, Other Payables [Member] \| Westwood, NJ [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	460
Variable rate mortgage loan	25,000
Notes Payable, Other Payables [Member] \| Baltimore, MD [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	160	800
Variable rate mortgage loan	118,520	118,520
Provident Bank [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs		52
Line of credit