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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, 2018
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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