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Note 5 - Loans Receivable and Allowance for Loan Losses - Impaired Loans (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Impaired loans, related allowance | $ 45,000 |  | $ 45,000 |  | $ 253,000
Impaired loans, recorded investment | 9,400,000 |  | 9,400,000 |  | 6,800,000
Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 9,345,000 |  | 9,345,000 |  | 6,500,000
Impaired loans with no related allowance recorded, unpaid principal balance | 10,086,000 |  | 10,086,000 |  | 7,295,000
Impaired loans with a related allowance recorded, recorded investment | 45,000 |  | 45,000 |  | 253,000
Impaired loans with a related allowance recorded, unpaid principal balance | 51,000 |  | 51,000 |  | 253,000
Impaired loans, related allowance | 45,000 |  | 45,000 |  | 253,000
Impaired loans, recorded investment | 9,390,000 |  | 9,390,000 |  | 6,753,000
Impaired loans, unpaid principal balance | 10,137,000 |  | 10,137,000 |  | 7,548,000
Impaired loans with no related allowance recorded, average recorded investment | 8,460,000 | $ 8,673,000 | 7,828,000 | $ 8,700,000 |
Impaired loans with no allowance recorded, interest income recognized | 36,000 | 83,000 | 70,000 | 163,000 |
Impaired loans with a related allowance recorded, average recorded investment | 296,000 | 232,000 | 246,000 | 232,000 |
Impaired loans with a related allowance recorded, interest income recognized |  |  |  |  |
Impaired loans, average recorded investment | 8,756,000 | 8,905,000 | 8,074,000 | 8,932,000 |
Impaired loans, interest income recognized | 36,000 | 83,000 | 70,000 | 163,000 |
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 4,071,000 |  | 4,071,000 |  | 1,977,000
Impaired loans with no related allowance recorded, unpaid principal balance | 4,524,000 |  | 4,524,000 |  | 2,425,000
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 | 4,071,000 |  | 4,071,000 |  | 1,977,000
Impaired loans, unpaid principal balance | 4,524,000 |  | 4,524,000 |  | 2,425,000
Impaired loans with no related allowance recorded, average recorded investment | 3,250,000 | 6,188,000 | 2,770,000 | 6,213,000 |
Impaired loans with no allowance recorded, interest income recognized | 25,000 | 75,000 | 49,000 | 148,000 |
Impaired loans with a related allowance recorded, average recorded investment |  |  |  |  |
Impaired loans with a related allowance recorded, interest income recognized |  |  |  |  |
Impaired loans, average recorded investment | 3,250,000 | 6,188,000 | 2,770,000 | 6,213,000 |
Impaired loans, interest income recognized | 25,000 | 75,000 | 49,000 | 148,000 |
Residential Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 3,524,000 |  | 3,524,000 |  | 3,336,000
Impaired loans with no related allowance recorded, unpaid principal balance | 3,557,000 |  | 3,557,000 |  | 3,369,000
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 | 3,524,000 |  | 3,524,000 |  | 3,336,000
Impaired loans, unpaid principal balance | 3,557,000 |  | 3,557,000 |  | 3,369,000
Impaired loans with no related allowance recorded, average recorded investment | 3,480,000 | 1,907,000 | 3,421,000 | 1,909,000 |
Impaired loans with no allowance recorded, interest income recognized | 3,000 | 3,000 | 6,000 | 5,000 |
Impaired loans with a related allowance recorded, average recorded investment |  |  |  |  |
Impaired loans with a related allowance recorded, interest income recognized |  |  |  |  |
Impaired loans, average recorded investment | 3,480,000 | 1,907,000 | 3,421,000 | 1,909,000 |
Impaired loans, interest income recognized | 3,000 | 3,000 | 6,000 | 5,000 |
Commercial Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 980,000 |  | 980,000 |  | 497,000
Impaired loans with no related allowance recorded, unpaid principal balance | 1,163,000 |  | 1,163,000 |  | 683,000
Impaired loans with a related allowance recorded, recorded investment | 45,000 |  | 45,000 |  | 251,000
Impaired loans with a related allowance recorded, unpaid principal balance | 51,000 |  | 51,000 |  | 251,000
Impaired loans, related allowance | 45,000 |  | 45,000 |  | 251,000
Impaired loans, recorded investment | 1,025,000 |  | 1,025,000 |  | 748,000
Impaired loans, unpaid principal balance | 1,214,000 |  | 1,214,000 |  | 934,000
Impaired loans with no related allowance recorded, average recorded investment | 980,000 | 37,000 | 912,000 | 37,000 |
Impaired loans with no allowance recorded, interest income recognized |  |  |  |  |
Impaired loans with a related allowance recorded, average recorded investment | 293,000 | 232,000 | 244,000 | 232,000 |
Impaired loans with a related allowance recorded, interest income recognized |  |  |  |  |
Impaired loans, average recorded investment | 1,273,000 | 269,000 | 1,156,000 | 269,000 |
Impaired loans, interest income recognized |  |  |  |  |
Consumer Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 770,000 |  | 770,000 |  | 690,000
Impaired loans with no related allowance recorded, unpaid principal balance | 842,000 |  | 842,000 |  | 818,000
Impaired loans with a related allowance recorded, recorded investment |  |  |  |  | 2,000
Impaired loans with a related allowance recorded, unpaid principal balance |  |  |  |  | 2,000
Impaired loans, related allowance |  |  |  |  | 2,000
Impaired loans, recorded investment | 770,000 |  | 770,000 |  | 692,000
Impaired loans, unpaid principal balance | 842,000 |  | 842,000 |  | $ 820,000
Impaired loans with no related allowance recorded, average recorded investment | 750,000 | 541,000 | 725,000 | 541,000 |
Impaired loans with no allowance recorded, interest income recognized | 8,000 | 5,000 | 15,000 | 10,000 |
Impaired loans with a related allowance recorded, average recorded investment | 3,000 |  | 2,000 |  |
Impaired loans with a related allowance recorded, interest income recognized |  |  |  |  |
Impaired loans, average recorded investment | 753,000 | 541,000 | 727,000 | 541,000 |
Impaired loans, interest income recognized | $ 8,000 | $ 5,000 | $ 15,000 | $ 10,000 |

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