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Note 12 - Pension and Other Postretirement Benefit Plans - Employee Benefit Trust (EBT) Shares (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Shares owned by Employee Benefit Trust, beginning balance (in shares) | 445,022 | 551,762
Shares purchased (in shares) | 13,669 | 11,631
Shares released and allocated (in shares) | (129,601) | (118,371)
Shares owned by Employee Benefit Trust, ending balance (in shares) | 329,090 | 445,022
Market value of unallocated shares | $ 7,085,308 | $ 12,238,105

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- Definition Number of shares purchased during the period by the Employee Trust. + References No definition available. + Details
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Namespace Prefix: | ffic_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Common stock released and allocated by the Employee Trust. + References No definition available. + Details
Name: | ffic_CommonStockSharesReleasedAndAllocatedByTheEmployeeTrust
Namespace Prefix: | ffic_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate value of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=75028277&loc=d3e19833-108362 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=75028277&loc=d3e19850-108362 + Details
Name: | us-gaap_CommonStockIssuedEmployeeTrustDeferred
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109244457&loc=d3e16701-113920 + Details
Name: | us-gaap_CommonStockSharesHeldInEmployeeTrustShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant