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Note 3 - Loans and Allowance for Loan Losses - Loans Modified and Classified as TDR (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Financing Receivable, Modifications, Number of Contracts | 10 | 15 | 1
Financing Receivable, Modifications, Balance | $ 6,741 | $ 10,351 | $ 41
Taxi Medallion Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts | 10 | 12 |
Financing Receivable, Modifications, Balance | $ 6,741 | $ 9,764 |
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 2 |
Financing Receivable, Modifications, Balance |  | $ 263 |
Small Business Administration Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts |  |  | 1
Financing Receivable, Modifications, Balance |  |  | $ 41
Commercial Business and Other Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member] |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 1 |
Financing Receivable, Modifications, Balance |  | $ 324 |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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