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Note 4 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
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 | 779 | 791
Impaired loans with an allowance recorded, unpaid principal balance | 779 | 791
Impaired loans, related allowances | 88 | 98
Impaired loans, carrying amount | 779 | 791
Impaired loans, unpaid principal balance | 779 | 791
Impaired loans, average recorded investment | 782 | 1,688
Impaired loans, interest income recognized | 13 | 55
Impaired loans, interest income received | 14 | 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 |  |
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 |  | 902
Impaired loans, interest income recognized |  |
Impaired loans, interest income received |  |
Real Estate [Member] | Secured by 1-4 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 | 186 | 187
Impaired loans with an allowance recorded, unpaid principal balance | 186 | 187
Impaired loans, related allowances | 5 | 5
Impaired loans, carrying amount | 186 | 187
Impaired loans, unpaid principal balance | 186 | 187
Impaired loans, average recorded investment | 187 | 190
Impaired loans, interest income recognized | 3 | 13
Impaired loans, interest income received | 3 | 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 |  |
Impaired loans with no related allowance recorded, unpaid principal balance |  |
Impaired loans with an allowance recorded, carrying amount | 524 | 532
Impaired loans with an allowance recorded, unpaid principal balance | 524 | 532
Impaired loans, related allowances | 14 | 21
Impaired loans, carrying amount | 524 | 532
Impaired loans, unpaid principal balance | 524 | 532
Impaired loans, average recorded investment | 526 | 537
Impaired loans, interest income recognized | 9 | 35
Impaired loans, interest income received | 9 | 35
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 | 69 | 72
Impaired loans with an allowance recorded, unpaid principal balance | 69 | 72
Impaired loans, related allowances | 69 | 72
Impaired loans, carrying amount | 69 | 72
Impaired loans, unpaid principal balance | 69 | $ 72
Impaired loans, average recorded investment | 69 |
Impaired loans, interest income recognized | 1 |
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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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + 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)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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