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Deferred fee plan (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Trustee fee expense $ 187us-gaap_TrusteeFees       
Dividends payable 2,046us-gaap_DividendsPayableCurrentAndNoncurrent 2,077us-gaap_DividendsPayableCurrentAndNoncurrent   2,046us-gaap_DividendsPayableCurrentAndNoncurrent
Deferred Fee Plan [Member]        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Trustee fee expense     184us-gaap_TrusteeFees
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= frevsob_DeferredFeeMember
 
Deferred trustee fees 187us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= frevsob_DeferredFeeMember
     
Basis spread on any deferred fee (percentage)     1.50%frevsob_BasisSpreadOnAnyDeferredFee
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= frevsob_DeferredFeeMember
 
Term of distribution to participants     10 years  
Shares issued     9,807us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= frevsob_DeferredFeeMember
 
Dividends payable $ 3us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= frevsob_DeferredFeeMember