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Note 15 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions | 2 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2007 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loans and Leases Receivable, Commitments, Fixed Rates |  | $ 39.6 |  |
Loans and Leases Receivable, Commitments, Weighted Average Rate of Interest |  | 4.93% |  |
Loans and Leases Receivable, Commitments, Variable Rates |  | $ 301.9 |  |
Loans and Leases Receivable, Commitments, Variable Rates, Weighted Average Rate |  | 3.66% |  |
Loan Commitments, Expiration |  | 90 days |  |
Line of Credit, Maturity, Max |  | 1 year 180 days |  |
Operating Leases, Rent Expense |  | $ 6.3 | $ 5.8 | $ 5.8
Capital Securities [Member] | Flushing Financial's Capital Trusts [Member] |  |  |  |
Proceeds from Issuance of Debt | $ 61.9 |  |  |
Home Equity Line of Credit [Member] |  |  |  |
Loans and Leases Receivable, Commitments, Credit |  | $ 224.7 |  |
Line of Credit, Maturity, Max |  | 10 years |  |
Letter of Credit Pledged as Collateral [Member] |  |  |  |
Deposit Liabilities, Collateral Issued, Financial Instruments |  | $ 402.1 | $ 382.5 |
Mortgages [Member] |  |  |  |
Loans and Leases Receivable, Commitments, Credit |  | $ 116.7 |  |

X
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