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Income taxes (Details) (USD $)
12 Months Ended 0 Months Ended 3 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Dec. 20, 2013
Jun. 18, 2014
Jan. 31, 2015
Ordinary taxable income distributed as dividends (percentage) 100.00%frevsob_DistributedEarningsPercentage 100.00%frevsob_DistributedEarningsPercentage        
Capital gain on sale of apartments     $ 3,500,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax      
South Brunswick property [Member]            
Capital gain on sale of apartments       8,700,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= frevsob_Discontinued3Member
   
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