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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings That are Performing According to Their Restructured Terms (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015
Number of contracts | 10 | 15 | 1
Performing Financial Instruments [Member] |  |  |
Number of contracts | 41 | 33 |
Recorded investment | $ 13,207 | $ 17,435 |
Multi-Family Residential [Member] | Performing Financial Instruments [Member] |  |  |
Number of contracts | 9 | 9 |
Recorded investment | $ 2,518 | $ 2,572 |
Commercial Real Estate Loans [Member] | Performing Financial Instruments [Member] |  |  |
Number of contracts | 2 | 2 |
Recorded investment | $ 1,986 | $ 2,062 |
One-To-Four Family - Mixed Used Property [Member] | Performing Financial Instruments [Member] |  |  |
Number of contracts | 5 | 5 |
Recorded investment | $ 1,753 | $ 1,800 |
One-To-Four Family - Residential [Member] | Performing Financial Instruments [Member] |  |  |
Number of contracts | 3 | 3 |
Recorded investment | $ 572 | $ 591 |
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |  |
Number of contracts | 20 | 12 |
Recorded investment | $ 5,916 | $ 9,735 |
Commercial Business and Other [Member] | Performing Financial Instruments [Member] |  |  |
Number of contracts | 2 | 2 |
Recorded investment | $ 462 | $ 675 |

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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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- Definition The amount of the outstanding recorded investment related to 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 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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