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Mortgages, notes payable and credit line (Narrative) (Details) (USD $)
12 Months Ended 0 Months Ended 1 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Jan. 14, 2013
Feb. 01, 2010
Feb. 01, 2012
Jan. 30, 2010
Debt Instrument [Line Items]              
Repayment of mortgages and construction loan $ 13,260,000us-gaap_RepaymentsOfSecuredDebt $ 45,747,000us-gaap_RepaymentsOfSecuredDebt $ 6,337,000us-gaap_RepaymentsOfSecuredDebt        
Construction and pre-development costs 33,579,000us-gaap_PaymentsForConstructionInProcess [1] 4,732,000us-gaap_PaymentsForConstructionInProcess [2] 3,999,000us-gaap_PaymentsForConstructionInProcess [3]        
Amount due within five years 91,102,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive            
Mortgages [Member] | Frederick, MD [Member]              
Debt Instrument [Line Items]              
Fixed interest rate 5.55%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Collateral Amount 17,197,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Mortgages [Member] | Rockaway, NJ Mortgage [Member]              
Debt Instrument [Line Items]              
Fixed interest rate 5.37%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_RockawayNjMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Periodic Payment 115,850us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= frevsob_RockawayNjMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Collateral Amount 17,080,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_RockawayNjMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Mortgages [Member] | Westwood, NJ#1 [Member]              
Debt Instrument [Line Items]              
Refinanced loan amount       8,000,000us-gaap_ShortTermDebtRefinancedAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages3Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
     
Mortgages [Member] | Westwood, NJ #2 [Member]              
Debt Instrument [Line Items]              
Fixed interest rate 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages10Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Periodic Payment 129,702us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages10Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Collateral Amount 8,375,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages10Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Loan amount 22,750,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages10Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Mortgages [Member] | Patchogue, NY [Member]              
Debt Instrument [Line Items]              
Fixed interest rate 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages5Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Periodic Payment 31,046us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages5Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Collateral Amount 7,152,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages5Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Loan To Value 75.00%frevsob_LoanToValue
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages5Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Mortgages [Member] | Wayne, NJ Mortgage 1 [Member]              
Debt Instrument [Line Items]              
Fixed interest rate 6.09%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_WayneNjMortgage1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Periodic Payment 121,100us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= frevsob_WayneNjMortgage1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Collateral Amount 1,653,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_WayneNjMortgage1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Mortgages [Member] | River Edge, NJ First Mortgage [Member]              
Debt Instrument [Line Items]              
Fixed interest rate 6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_MortgagesFirstMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Periodic Payment 34,862us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= frevsob_MortgagesFirstMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Mortgages [Member] | River Edge, NJ Second Mortgage [Member]              
Debt Instrument [Line Items]              
Fixed interest rate 5.53%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_MortgagesSecondMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Periodic Payment 12,318us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= frevsob_MortgagesSecondMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Mortgages [Member] | River Edge, NJ Refinanced Mortgage [Member]              
Debt Instrument [Line Items]              
Fixed interest rate 4.54%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_RiverEdgeNjRefinancedMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Collateral Amount 942,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_RiverEdgeNjRefinancedMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Loan amount 11,200,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_RiverEdgeNjRefinancedMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Mortgages [Member] | Maywood, NJ First Mortgage [Member]              
Debt Instrument [Line Items]              
Fixed interest rate 6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_MortgagesFirst1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Periodic Payment 25,295us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= frevsob_MortgagesFirst1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Mortgages [Member] | Maywood, NJ Second Mortgage [Member]              
Debt Instrument [Line Items]              
Fixed interest rate 5.53%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_MortgagesSecond1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Periodic Payment 8,739us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= frevsob_MortgagesSecond1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Mortgages [Member] | Refinanced Maywood, NJ Mortgage [Member]              
Debt Instrument [Line Items]              
Fixed interest rate 4.54%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_RefinancedMaywoodNjMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Collateral Amount 748,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_RefinancedMaywoodNjMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Loan amount 8,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_RefinancedMaywoodNjMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Mortgages [Member] | Westwood, NJ #3 [Member]              
Debt Instrument [Line Items]              
Fixed interest rate 4.62%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages7Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Periodic Payment 120,752us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages7Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Collateral Amount 10,398,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages7Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Mortgages [Member] | Second Wayne, NJ Mortgage [Member]              
Debt Instrument [Line Items]              
Fixed interest rate 6.04%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_SecondWayneNjMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Periodic Payment 206,960us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= frevsob_SecondWayneNjMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Collateral Amount 26,945,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_SecondWayneNjMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Mortgages [Member] | Hackensack, NJ [Member]              
Debt Instrument [Line Items]              
Fixed interest rate 5.38%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages9Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Periodic Payment 191,197us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages9Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Collateral Amount 41,546,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_Mortgages9Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Mortgages [Member] | Damascus, MD [Member]              
Debt Instrument [Line Items]              
Basis points, interest rate 2.10%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Fixed interest rate 3.81%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Debt Instrument, Collateral Amount 29,644,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Loan amount 25,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Amount drawn on loan 20,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Unused loan draw 5,000,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
           
Term of the loan 36 months            
Notes Payable, Other Payables [Member] | Baltimore, MD [Member]              
Debt Instrument [Line Items]              
Basis points, interest rate 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
           
Debt Instrument, Collateral Amount 79,268,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
           
Loan amount         19,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
  22,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Construction and pre-development costs 23,700,000us-gaap_PaymentsForConstructionInProcess
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
           
Debt reduction         3,000,000us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
110,000us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
 
Interest rate floor 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
           
Monthly principal payment amount 10,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
           
Amount due within five years 42,689,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
           
Repayments of debt to affiliate 19,000,000us-gaap_RepaymentsOfRelatedPartyDebt
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
           
Notes Payable, Other Payables [Member] | Baltimore, MD [Member] | Construction in Progress [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Collateral Amount 48,800,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
           
Provident Bank [Member]              
Debt Instrument [Line Items]              
Basis points, interest rate 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
           
Term of the loan 2 years            
Interest rate floor 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
           
Line of credit, maximum borrowing capacity 13,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  18,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
       
Line of credit, current borrowing capacity 8,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
           
Line of credit 5,000,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
           
Construction Loan [Member]              
Debt Instrument [Line Items]              
Refinanced loan amount 15,000,000us-gaap_ShortTermDebtRefinancedAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
15,000,000us-gaap_ShortTermDebtRefinancedAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
         
Loan amount   25,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
         
Amount drawn on loan 20,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
           
Construction Loan [Member] | Baltimore, MD [Member]              
Debt Instrument [Line Items]              
Basis points, interest rate 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
           
Loan amount $ 120,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
           
Term of the loan 4 years            
[1] Includes $3,766 that was incurred and accrued in fiscal 2013; paid in fiscal 2014.
[2] Includes $743 that was incurred and accrued in fiscal 2012; paid in fiscal 2013.
[3] Includes $2,256 that was incurred and accrued in fiscal 2011; paid in fiscal 2012.