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Note 9 - Borrowed Funds - Terms of the Securities Issued by the Trusts (Details) | 12 Months Ended
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Dec. 31, 2017
Flushing Financial Capital Trust II [Member] | Capital Securities [Member] |
Issue Date | Jun. 20, 2007
Initial Rate | 7.14%
First Reset Date | Sep. 01, 2012
Spread over 3-month LIBOR | 1.41%
Maturity Date | Sep. 01, 2037
Flushing Financial Capital Trust III [Member] | Capital Securities [Member] |
Issue Date | Jun. 21, 2007
Initial Rate | 6.89%
First Reset Date | Jun. 15, 2012
Spread over 3-month LIBOR | 1.44%
Maturity Date | Sep. 15, 2037
Flushing Financial Capital Trust IV [Member] | Capital Securities [Member] |
Issue Date | Jul. 03, 2007
Initial Rate | 6.85%
First Reset Date | Jul. 30, 2012
Spread over 3-month LIBOR | 1.42%
Maturity Date | Jul. 30, 2037
Subordinated Debt [Member] |
Issue Date | Dec. 12, 2016
Initial Rate | 5.25%
First Reset Date | Dec. 15, 2021
First Call Date | Dec. 15, 2021
Maturity Date | Dec. 15, 2026
Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] |
Spread over 3-month LIBOR | 3.44%

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- Definition Earliest date before maturity when the issuer can call the outstanding debt instrument for repayment or conversion to equity, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 + Details
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