Management agreement, fees and transactions with related party (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Jan. 31, 2015	Jan. 31, 2014
Related Party Transaction [Line Items]
Asset management fees	$ 486us-gaap_OwnedPropertyManagementCosts	$ 468us-gaap_OwnedPropertyManagementCosts
Trustee fees and related interest payable in stock units	187us-gaap_TrusteeFees
Managing Agent Hekemian & Co [Member]
Related Party Transaction [Line Items]
Asset management fees	460	444
Leasing commissions and reimbursement of operating expenses	69	69
Insurance commissions	45	30
Sales commissions		330
Other fees - refinancing		99
Robert S. Hekemian [Member]
Related Party Transaction [Line Items]
Trustee fees and related interest payable in stock units	132	156
Robert S. Hekemian, Jr. [Member]
Related Party Transaction [Line Items]
Trustee fees and related interest payable in stock units	16	11
Affiliated Entity 1 [Member]
Related Party Transaction [Line Items]
Redevelopment fees	$ 482	$ 429

The amount of fees paid to related entity for refinancing services.

No definition available.

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Namespace Prefix:	frevsob_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The expense incurred to persons or entities for securing insurance coverage for properties and subsidiaries.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of commissions expense incurred because the lessor of real estate obtained a lessee for a rental property through a real estate agent and generally recurring costs associated with operations.

+ References

No definition available.

+ Details

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Namespace Prefix:	frevsob_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The fee expense for real estate redevelopment.

+ References

No definition available.

+ Details

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Namespace Prefix:	frevsob_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Article 5

+ Details

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

- Definition

The aggregate costs related to management of owned properties during the reporting period.

+ References

+ Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionLineItems
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Balance Type:	na
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- Definition

Fees charged annually for the professional services of a trustee, usually quoted as a percentage of the funds being managed. The fee for appointing an offshore Trustee is included in the trust price.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=frevsob_Director1Member
Namespace Prefix:
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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_DirectorMember
Namespace Prefix:
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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_ImmediateFamilyMemberOfManagementOrPrincipalOwnerMember
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