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Note 15 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | 2 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2007 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loans and Leases Receivable, Commitments, Fixed Rates |  | $ 26,600 |  |
Loans and Leases Receivable, Commitments, Weighted Average Rate of Interest |  | 4.80% |  |
Loans and Leases Receivable, Commitments, Variable Rates |  | $ 286,900 |  |
Loans and Leases Receivable, Commitments, Variable Rates, Weighted Average Rate |  | 5.45% |  |
Loan Commitments, Expiration |  | 90 days |  |
Line of Credit, Maturity, Max |  | 1 year 180 days |  |
Operating Leases, Rent Expense, Total |  | $ 6,100 | $ 6,300 | $ 5,800
Operating Leases, Future Minimum Payments Due, Total |  | 60,234 |  |
Other Equipment and Cars [Member] | Equipment Leases [Member] |  |  |  |
Operating Leases, Future Minimum Payments Due, Total |  | 500 |  |
Home Equity Line of Credit [Member] |  |  |  |
Loans and Leases Receivable, Commitments, Credit |  | $ 248,700 |  |
Line of Credit, Maturity, Max |  | 10 years |  |
Letter of Credit Pledged as Collateral [Member] |  |  |  |
Deposit Liabilities, Collateral Issued, Financial Instruments |  | $ 659,600 | $ 402,100 |
Capital Securities [Member] | Flushing Financial's Capital Trusts [Member] |  |  |  |
Proceeds from Issuance of Debt | $ 61,900 |  |  |
Mortgages [Member] |  |  |  |
Loans and Leases Receivable, Commitments, Credit |  | $ 64,900 |  |

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