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Note 5 - Loans Receivable and Allowance for Loan Losses - Impaired Loans (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Impaired loans, related allowance | $ 55,000 |  | $ 55,000 |  | $ 253,000
Impaired loans, recorded investment | 9,300,000 |  | 9,300,000 |  | 6,800,000
Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 9,258,000 |  | 9,258,000 |  | 6,500,000
Impaired loans with no related allowance recorded, unpaid principal balance | 10,628,000 |  | 10,628,000 |  | 7,295,000
Impaired loans with a related allowance recorded, recorded investment | 69,000 |  | 69,000 |  | 253,000
Impaired loans with a related allowance recorded, unpaid principal balance | 119,000 |  | 119,000 |  | 253,000
Impaired loans, related allowance | 55,000 |  | 55,000 |  | 253,000
Impaired loans, recorded investment | 9,327,000 |  | 9,327,000 |  | 6,753,000
Impaired loans, unpaid principal balance | 10,747,000 |  | 10,747,000 |  | 7,548,000
Impaired loans with no related allowance recorded, average recorded investment | 9,374,000 | $ 8,635,000 | 8,295,000 | $ 8,684,000 |
Impaired loans with no allowance recorded, interest income recognized | 32,000 | 10,000 | 101,000 | 174,000 |
Impaired loans with a related allowance recorded, average recorded investment | 50,000 | 245,000 | 189,000 | 237,000 |
Impaired loans with a related allowance recorded, interest income recognized |  |  |  |  |
Impaired loans, average recorded investment | 9,424,000 | 8,880,000 | 8,484,000 | 8,921,000 |
Impaired loans, interest income recognized | 32,000 | 10,000 | 101,000 | 174,000 |
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 3,989,000 |  | 3,989,000 |  | 1,977,000
Impaired loans with no related allowance recorded, unpaid principal balance | 4,481,000 |  | 4,481,000 |  | 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 | 3,989,000 |  | 3,989,000 |  | 1,977,000
Impaired loans, unpaid principal balance | 4,481,000 |  | 4,481,000 |  | 2,425,000
Impaired loans with no related allowance recorded, average recorded investment | 4,062,000 | 6,111,000 | 3,157,000 | 6,173,000 |
Impaired loans with no allowance recorded, interest income recognized | 21,000 | 10,000 | 70,000 | 159,000 |
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 | 4,062,000 | 6,111,000 | 3,157,000 | 6,173,000 |
Impaired loans, interest income recognized | 21,000 | 10,000 | 70,000 | 159,000 |
Residential Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 3,521,000 |  | 3,521,000 |  | 3,336,000
Impaired loans with no related allowance recorded, unpaid principal balance | 3,554,000 |  | 3,554,000 |  | 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 | 3,521,000 |  | 3,521,000 |  | 3,336,000
Impaired loans, unpaid principal balance | 3,554,000 |  | 3,554,000 |  | 3,369,000
Impaired loans with no related allowance recorded, average recorded investment | 3,523,000 | 1,903,000 | 3,451,000 | 1,907,000 |
Impaired loans with no allowance recorded, interest income recognized | 3,000 |  | 8,000 | 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 | 3,523,000 | 1,903,000 | 3,451,000 | 1,907,000 |
Impaired loans, interest income recognized | 3,000 |  | 8,000 | 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 | 1,751,000 |  | 1,751,000 |  | 683,000
Impaired loans with a related allowance recorded, recorded investment | 48,000 |  | 48,000 |  | 251,000
Impaired loans with a related allowance recorded, unpaid principal balance | 98,000 |  | 98,000 |  | 251,000
Impaired loans, related allowance | 48,000 |  | 48,000 |  | 251,000
Impaired loans, recorded investment | 1,028,000 |  | 1,028,000 |  | 748,000
Impaired loans, unpaid principal balance | 1,849,000 |  | 1,849,000 |  | 934,000
Impaired loans with no related allowance recorded, average recorded investment | 1,018,000 | 37,000 | 948,000 | 46,000 |
Impaired loans with no allowance recorded, interest income recognized |  |  |  |  |
Impaired loans with a related allowance recorded, average recorded investment | 45,000 | 245,000 | 185,000 | 237,000 |
Impaired loans with a related allowance recorded, interest income recognized |  |  |  |  |
Impaired loans, average recorded investment | 1,063,000 | 282,000 | 1,133,000 | 283,000 |
Impaired loans, interest income recognized |  |  |  |  |
Consumer Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 768,000 |  | 768,000 |  | 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 | 21,000 |  | 21,000 |  | 2,000
Impaired loans with a related allowance recorded, unpaid principal balance | 21,000 |  | 21,000 |  | 2,000
Impaired loans, related allowance | 7,000 |  | 7,000 |  | 2,000
Impaired loans, recorded investment | 789,000 |  | 789,000 |  | 692,000
Impaired loans, unpaid principal balance | 863,000 |  | 863,000 |  | $ 820,000
Impaired loans with no related allowance recorded, average recorded investment | 771,000 | 584,000 | 739,000 | 558,000 |
Impaired loans with no allowance recorded, interest income recognized | 8,000 |  | 23,000 | 10,000 |
Impaired loans with a related allowance recorded, average recorded investment | 5,000 |  | 4,000 |  |
Impaired loans with a related allowance recorded, interest income recognized |  |  |  |  |
Impaired loans, average recorded investment | 776,000 | 584,000 | 743,000 | 558,000 |
Impaired loans, interest income recognized | $ 8,000 |  | $ 23,000 | $ 10,000 |

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