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Note 3 - Loan Receivables and Allowance for Loan Losses - Impaired Loans (Details) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Impaired loans with no related allowance recorded, recorded investment | $ 8,653,000 | $ 8,720,000
Impaired loans with no related allowance recorded, unpaid principal balance | 9,514,000 | 10,267,000
Impaired loans with a related allowance recorded, recorded investment | 232,000 | 231,000
Impaired loans with a related allowance recorded, unpaid principal balance | 232,000 | 231,000
Impaired loans, related allowance | 232,000 | 231,000
Impaired loans, recorded investment | 8,885,000 | 8,951,000
Impaired loans, unpaid principal balance | 9,746,000 | 10,498,000
Commercial Real Estate Portfolio Segment [Member] |  |
Impaired loans with no related allowance recorded, recorded investment | 6,204,000 | 6,267,000
Impaired loans with no related allowance recorded, unpaid principal balance | 6,656,000 | 6,721,000
Impaired loans with a related allowance recorded, recorded investment |  |
Impaired loans with a related allowance recorded, unpaid principal balance |  |
Impaired loans, related allowance |  |
Impaired loans, recorded investment | 6,204,000 | 6,267,000
Impaired loans, unpaid principal balance | 6,656,000 | 6,721,000
Residential Portfolio Segment [Member] |  |
Impaired loans with no related allowance recorded, recorded investment | 1,908,000 | 1,911,000
Impaired loans with no related allowance recorded, unpaid principal balance | 1,941,000 | 2,915,000
Impaired loans with a related allowance recorded, recorded investment |  |
Impaired loans with a related allowance recorded, unpaid principal balance |  |
Impaired loans, related allowance |  |
Impaired loans, recorded investment | 1,908,000 | 1,911,000
Impaired loans, unpaid principal balance | 1,941,000 | 2,915,000
Commercial Portfolio Segment [Member] |  |
Impaired loans with no related allowance recorded, recorded investment |  |
Impaired loans with no related allowance recorded, unpaid principal balance |  |
Impaired loans with a related allowance recorded, recorded investment | 232,000 | 231,000
Impaired loans with a related allowance recorded, unpaid principal balance | 232,000 | 231,000
Impaired loans, related allowance | 232,000 | 231,000
Impaired loans, recorded investment | 232,000 | 231,000
Impaired loans, unpaid principal balance | 232,000 | 231,000
Consumer Portfolio Segment [Member] |  |
Impaired loans with no related allowance recorded, recorded investment | 541,000 | 542,000
Impaired loans with no related allowance recorded, unpaid principal balance | 630,000 | 631,000
Impaired loans with a related allowance recorded, recorded investment |  |
Impaired loans with a related allowance recorded, unpaid principal balance |  |
Impaired loans, related allowance |  |
Impaired loans, recorded investment | 541,000 | 542,000
Impaired loans, unpaid principal balance | 630,000 | 631,000
Construction Portfolio Segment [Member] |  |
Impaired loans with no related allowance recorded, recorded investment |  |
Impaired loans with no related allowance recorded, unpaid principal balance | 287,000 |
Impaired loans with a related allowance recorded, recorded investment |  |
Impaired loans with a related allowance recorded, unpaid principal balance |  |
Impaired loans, related allowance |  |
Impaired loans, recorded investment |  |
Impaired loans, unpaid principal balance | $ 287,000 |

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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