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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - The Retirement Plan’s Weighted Average Asset Allocations (Retirement Plan [Member])
Dec. 31, 2014
Dec. 31, 2013
Equity Securities [Member]    
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - The Retirement Plan’s Weighted Average Asset Allocations [Line Items]    
Weighted average asset allocation 68.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ffic_RetirementPlanMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 69.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ffic_RetirementPlanMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Debt Securities [Member]    
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - The Retirement Plan’s Weighted Average Asset Allocations [Line Items]    
Weighted average asset allocation 32.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ffic_RetirementPlanMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		 31.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ffic_RetirementPlanMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember