Name:	frevsob_BusinessAcquisitionProFormaIncomeLossFromDiscontinuedOperationsNetOfTaxPerShareBasic
Namespace Prefix:	frevsob_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

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

Number of shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Specifically calculated for a period as if the business combination or combinations had been completed at the beginning of a period.

No definition available.

Name:	frevsob_BusinessAcquisitionProFormaWeightedAverageSharesOutstandingBasicAndDiluted
Namespace Prefix:	frevsob_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The pro forma net expenses for a period as if the business combination or combinations had been completed at the beginning of the period.

No definition available.

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

The pro forma amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component for the period as if the business combination or combinations had been completed at the beginning of a period.

No definition available.

Name:	frevsob_BusinessAcquisitionsProFormaIncomeGainLossFromSaleOfDiscontinuedOperations
Namespace Prefix:	frevsob_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The pro forma income from discontinued operations for the period as if the business combination or combinations had been completed at the beginning of a period.

No definition available.

Name:	frevsob_BusinessAcquisitionsProFormaIncomeLossFromDiscontinuedOperations
Namespace Prefix:	frevsob_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The pro forma net income or loss attributable to noncontrolling interests for the period as if the business combination or combinations had been completed at the beginning of a period.

No definition available.

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

The pro forma net income or loss, inclusive of amounts attributable to noncontrolling interests, for the period as if the business combination or combinations had been completed at the beginning of a period.

No definition available.

Name:	frevsob_BusinessAcquisitionsProFormaProfitLoss
Namespace Prefix:	frevsob_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

Name:	us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect per basic share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period.

Name:	us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

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

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period.

Name:	us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

Name:	us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.