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Discontinued operations (Details) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Jan. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Dec. 20, 2013
Apr. 26, 2013
Aug. 13, 2013
Aug. 29, 2012
Jan. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Capital gain on sale of apartments     $ 3,500,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax $ 9,493,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax          
Tax on sale of discontinued operations       1,965,000us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation          
Income tax adjustment on gain on sale of discontinued operation (720,000)us-gaap_DiscontinuedOperationTaxEffectOfAdjustmentToPriorPeriodGainLossOnDisposal    (720,000)us-gaap_DiscontinuedOperationTaxEffectOfAdjustmentToPriorPeriodGainLossOnDisposal [1]             
Revenue from discontinued operations   1,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue 317,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue 1,299,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue          
South Brunswick property [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Sale of property         11,000,000us-gaap_ProceedsFromSaleOfPropertyHeldForSale
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_Discontinued3Member		        
Capital gain on sale of apartments         8,700,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_Discontinued3Member		        
Deferred gain on sale         8,700,000us-gaap_DeferredGainOnSaleOfProperty
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_Discontinued3Member		        
Net proceeds on sale of business         9,800,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_Discontinued3Member		        
Palisades Manor Apartments [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Sale of property           1,600,000us-gaap_ProceedsFromSaleOfPropertyHeldForSale
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_Discontinued1Member		      
Capital gain on sale of apartments           1,400,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_Discontinued1Member		      
Grandview Apartments [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Sale of property             2,500,000us-gaap_ProceedsFromSaleOfPropertyHeldForSale
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_Discontinued2Member		    
Capital gain on sale of apartments             2,200,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_Discontinued2Member		    
Heights Manor Apartments [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Capital gain on sale of apartments       9,500,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_DiscontinuedMember		       9,500,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_DiscontinuedMember		  
Distributions to shareholders       5,000,000us-gaap_PaymentsOfCapitalDistribution
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_DiscontinuedMember		       5,000,000us-gaap_PaymentsOfCapitalDistribution
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_DiscontinuedMember		 1,400,000us-gaap_PaymentsOfCapitalDistribution
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_DiscontinuedMember
Undistributed gain               4,500,000us-gaap_UndistributedNetRealizedGainOrLossOnSaleOfProperties
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_DiscontinuedMember		  
Income tax adjustment on gain on sale of discontinued operation     (720,000)us-gaap_DiscontinuedOperationTaxEffectOfAdjustmentToPriorPeriodGainLossOnDisposal
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_DiscontinuedMember		            
Heights Manor Apartments [Member] | Federal [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Tax on sale of discontinued operations       1,500,000us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_DiscontinuedMember
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		          
Heights Manor Apartments [Member] | State [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Tax on sale of discontinued operations       $ 400,000us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_DiscontinuedMember
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		          
[1] Income tax adjustment relating to fiscal 2012 gain on sale of discontinued operation.