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Note 5 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Impaired loans with no related allowance recorded, carrying amount | $ 2,238 |
Impaired loans with no related allowance recorded, unpaid principal balance | 2,238 |
Impaired loans with an allowance recorded, carrying amount | 842 | 791
Impaired loans with an allowance recorded, unpaid principal balance | 842 | 791
Impaired loans, related allowances | 178 | 98
Impaired loans, carrying amount | 3,080 | 791
Impaired loans, unpaid principal balance | 3,080 | 791
Impaired loans, average recorded investment | 1,020 | 1,688
Impaired loans, interest income recognized | 37 | 55
Impaired loans, interest income received | 40 | 54
Real Estate [Member] |  |
Impaired loans, average recorded investment |  | 59
Impaired loans, interest income recognized |  | 7
Impaired loans, interest income received |  | 5
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] |  |
Impaired loans with no related allowance recorded, carrying amount | 73 |
Impaired loans with no related allowance recorded, unpaid principal balance | 73 |
Impaired loans with an allowance recorded, carrying amount | 155 |
Impaired loans with an allowance recorded, unpaid principal balance | 155 |
Impaired loans, related allowances | 31 |
Impaired loans, carrying amount | 228 |
Impaired loans, unpaid principal balance | 228 |
Impaired loans, average recorded investment | 52 | 902
Impaired loans, interest income recognized | 6 |
Impaired loans, interest income received | 6 |
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] |  |
Impaired loans with no related allowance recorded, carrying amount | 2,150 |
Impaired loans with no related allowance recorded, unpaid principal balance | 2,150 |
Impaired loans with an allowance recorded, carrying amount | 58 | 187
Impaired loans with an allowance recorded, unpaid principal balance | 58 | 187
Impaired loans, related allowances | 51 | 5
Impaired loans, carrying amount | 2,208 | 187
Impaired loans, unpaid principal balance | 2,208 | 187
Impaired loans, average recorded investment | 370 | 190
Impaired loans, interest income recognized | 1 | 13
Impaired loans, interest income received | 1 | 14
Real Estate [Member] | Secured by Multi-family Residential Properties [Member] |  |
Impaired loans with no related allowance recorded, carrying amount |  |
Impaired loans with no related allowance recorded, unpaid principal balance |  |
Impaired loans with an allowance recorded, carrying amount |  |
Impaired loans with an allowance recorded, unpaid principal balance |  |
Impaired loans, related allowances |  |
Impaired loans, carrying amount |  |
Impaired loans, unpaid principal balance |  |
Impaired loans, average recorded investment |  |
Impaired loans, interest income recognized |  |
Impaired loans, interest income received |  |
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] |  |
Impaired loans with no related allowance recorded, carrying amount | 8 |
Impaired loans with no related allowance recorded, unpaid principal balance | 8 |
Impaired loans with an allowance recorded, carrying amount | 517 | 532
Impaired loans with an allowance recorded, unpaid principal balance | 517 | 532
Impaired loans, related allowances | 7 | 21
Impaired loans, carrying amount | 525 | 532
Impaired loans, unpaid principal balance | 525 | 532
Impaired loans, average recorded investment | 524 | 537
Impaired loans, interest income recognized | 25 | 35
Impaired loans, interest income received | 27 | 35
Real Estate [Member] | Other Real Estate Loans [Member] |  |
Impaired loans with no related allowance recorded, carrying amount | 7 |
Impaired loans with no related allowance recorded, unpaid principal balance | 7 |
Impaired loans with an allowance recorded, carrying amount |  |
Impaired loans with an allowance recorded, unpaid principal balance |  |
Impaired loans, related allowances |  |
Impaired loans, carrying amount | 7 |
Impaired loans, unpaid principal balance | 7 |
Impaired loans, average recorded investment | 1 |
Impaired loans, interest income recognized |  |
Impaired loans, interest income received |  |
Commercial and Industrial Loans [Member] |  |
Impaired loans with no related allowance recorded, carrying amount |  |
Impaired loans with no related allowance recorded, unpaid principal balance |  |
Impaired loans with an allowance recorded, carrying amount | 67 | 72
Impaired loans with an allowance recorded, unpaid principal balance | 67 | 72
Impaired loans, related allowances | 67 | 72
Impaired loans, carrying amount | 67 | 72
Impaired loans, unpaid principal balance | 67 | $ 72
Impaired loans, average recorded investment | 68 |
Impaired loans, interest income recognized | 3 |
Impaired loans, interest income received | 4 |
Consumer Portfolio Segment [Member] |  |
Impaired loans with no related allowance recorded, carrying amount |  |
Impaired loans with no related allowance recorded, unpaid principal balance |  |
Impaired loans with an allowance recorded, carrying amount | 45 |
Impaired loans with an allowance recorded, unpaid principal balance | 45 |
Impaired loans, related allowances | 22 |
Impaired loans, carrying amount | 45 |
Impaired loans, unpaid principal balance | 45 |
Impaired loans, average recorded investment | 5 |
Impaired loans, interest income recognized | 2 |
Impaired loans, interest income received | $ 2 |

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- Definition Average 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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