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Note 5 - Loans - Troubled Debt Restructurings That Are Not Performing According to Their Restructured Terms (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | 0 |
Nonperforming Financial Instruments [Member] |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | 6 | 2
Recorded investment, not performing | $ 2,003 | $ 1,785
Multi-family Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | 1 | 1
Recorded investment, not performing | $ 383 | $ 388
Taxi Medallion Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | 3 |
Recorded investment, not performing | $ 768 |
Commercial Business and Other Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | 2 | 1
Recorded investment, not performing | $ 852 | $ 1,397

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