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Mortgage refinancings (Details) (USD $)
3 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Nov. 19, 2013
Oct. 31, 2014
Debt Instrument [Line Items]        
Repayment of mortgages and construction loan $ 1,001,000us-gaap_RepaymentsOfSecuredDebt $ 12,226,000us-gaap_RepaymentsOfSecuredDebt    
Construction and pre-development costs 16,449,000us-gaap_PaymentsForConstructionInProcess 2,679,000us-gaap_PaymentsForConstructionInProcess    
Mortgages [Member] | Refinanced Maywood, NJ Mortgage [Member]        
Debt Instrument [Line Items]        
Refinanced loan amount 19,700,000us-gaap_ShortTermDebtRefinancedAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_RefinancedMaywoodNjMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
     
Loan amount 9,400,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= frevsob_RefinancedMaywoodNjMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
     
Annual interest costs 4.54%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_RefinancedMaywoodNjMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
  6.40%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= frevsob_RefinancedMaywoodNjMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
 
Net proceeds from refinancing of debt 10,000,000us-gaap_ProceedsFromRepaymentsOfSecuredDebt
/ us-gaap_DebtInstrumentAxis
= frevsob_RefinancedMaywoodNjMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
     
Notes Payable, Other Payables [Member] | Baltimore, MD [Member]        
Debt Instrument [Line Items]        
Construction and pre-development costs 39,200,000us-gaap_PaymentsForConstructionInProcess
/ us-gaap_DebtInstrumentAxis
= frevsob_SecuredDebt1Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
     
Line of credit 58,200,000us-gaap_LineOfCredit
/ 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
     
Provident Bank [Member]        
Debt Instrument [Line Items]        
Basis points, interest rate 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Loan amount 16,200,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Amount drawn on loan 5,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Annual interest costs 3.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
     
Monthly principal payment amount 27,807us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ 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
   
Loan amount       25,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConstructionLoansMember
Amount drawn on loan 19,200,000us-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