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Note 5 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings That Are Performing According to Their Restructured Terms (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 | Dec. 31, 2017 USD ($)
Financing Receivable, Modifications, Number of Contracts | 0 | 0 |
Performing Financial Instruments [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts | 38 |  | 41
Recorded investment | $ 10,929 |  | $ 13,207
Multi-Family Residential [Member] | Performing Financial Instruments [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts | 9 |  | 9
Recorded investment | $ 2,503 |  | $ 2,518
Commercial Real Estate Loans [Member] | Performing Financial Instruments [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts |  |  | 2
Recorded investment |  |  | $ 1,986
One-To-Four Family - Mixed Used Property [Member] | Performing Financial Instruments [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts | 5 |  | 5
Recorded investment | $ 1,740 |  | $ 1,753
One-To-Four Family - Residential [Member] | Performing Financial Instruments [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts | 3 |  | 3
Recorded investment | $ 567 |  | $ 572
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts | 19 |  | 20
Recorded investment | $ 5,712 |  | $ 5,916
Commercial Business and Other [Member] | Performing Financial Instruments [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts | 2 |  | 2
Recorded investment | $ 407 |  | $ 462

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