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Income taxes (Details) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Jan. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Dec. 20, 2013
Aug. 29, 2012
Jan. 31, 2013
Apr. 26, 2013
Aug. 13, 2013
Jun. 18, 2014
Ordinary taxable income distributed as dividends (percentage)   100.00%frevsob_DistributedEarningsPercentage 100.00%frevsob_DistributedEarningsPercentage 100.00%frevsob_DistributedEarningsPercentage            
Capital gain on sale of apartments     $ 3,500,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax $ 9,493,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax            
Gain on sale of discontinued operations, tax effect       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]               
Distributions to shareholders 1,400,000us-gaap_PaymentsOfDividendsCommonStock 10,812,000us-gaap_PaymentsOfDividendsCommonStock 7,637,000us-gaap_PaymentsOfDividendsCommonStock 8,331,000us-gaap_PaymentsOfDividendsCommonStock            
South Brunswick property [Member]                    
Capital gain on sale of apartments         8,700,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_Discontinued3Member		          
Heights Manor Apartments [Member]                    
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		        
Income tax adjustment on gain on sale of discontinued operation     (720,000)us-gaap_DiscontinuedOperationTaxEffectOfAdjustmentToPriorPeriodGainLossOnDisposal
/ 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		        
Heights Manor Apartments [Member] | Federal [Member]                    
Gain on sale of discontinued operations, tax effect       1,500,000us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_DiscontinuedMember
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		            
Heights Manor Apartments [Member] | State [Member]                    
Gain on sale of discontinued operations, tax effect       400,000us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_DiscontinuedMember
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		            
Palisades Manor Apartments [Member]                    
Capital gain on sale of apartments               1,400,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_Discontinued1Member		    
Grandview Apartments [Member]                    
Capital gain on sale of apartments                 2,200,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_Discontinued2Member		  
Regency Club Acquisition [Member]                    
Acquisition price                   20,625,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= frevsob_RegencyClubMember
Amount tax basis is lower than the acquisition price   $ 8,000,000frevsob_AcquisitionTaxBasisDifferenceFromAcquisitionCost
/ us-gaap_BusinessAcquisitionAxis
= frevsob_RegencyClubMember		                
[1] Income tax adjustment relating to fiscal 2012 gain on sale of discontinued operation.