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Real estate (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Property, Plant and Equipment [Line Items]    
Land 79,435us-gaap_Land $ 76,602us-gaap_Land
Unimproved land 354us-gaap_LandAvailableForDevelopment 883us-gaap_LandAvailableForDevelopment
Equipment/Furniture 3,102us-gaap_FixturesAndEquipmentGross 2,967us-gaap_FixturesAndEquipmentGross
Real estate and equipment 303,886us-gaap_RealEstateInvestmentPropertyAtCost 280,677us-gaap_RealEstateInvestmentPropertyAtCost
Less accumulated depreciation 81,569us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation 75,226us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Totals 222,317us-gaap_RealEstateInvestmentPropertyNet 205,451us-gaap_RealEstateInvestmentPropertyNet
Apartment Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Rental properties 101,968us-gaap_RentalProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
81,972us-gaap_RentalProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
Commercial Buildings/Shopping Centers [Member]    
Property, Plant and Equipment [Line Items]    
Rental properties 119,027us-gaap_RentalProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frevsob_CommercialBuildingMember
$ 118,253us-gaap_RentalProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frevsob_CommercialBuildingMember
Minimum [Member] | Apartment Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 7 years  
Minimum [Member] | Commercial Buildings/Shopping Centers [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 15 years  
Maximum [Member] | Apartment Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 40 years  
Maximum [Member] | Commercial Buildings/Shopping Centers [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 50 years  
Equipment/Furniture [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 3 years  
Equipment/Furniture [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 15 years