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Note 4 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
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 | 880 | 2,103
Impaired loans with an allowance recorded, unpaid principal balance | 880 | 2,103
Impaired loans, related allowances | 194 | 535
Impaired loans, carrying amount | 880 | 2,103
Impaired loans, unpaid principal balance | 880 | 2,103
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 | 86 | 1,361
Impaired loans with an allowance recorded, unpaid principal balance | 86 | 1,361
Impaired loans, related allowances | 62 | 423
Impaired loans, carrying amount | 86 | 1,361
Impaired loans, unpaid principal balance | 86 | 1,361
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 | 189 | 193
Impaired loans with an allowance recorded, unpaid principal balance | 189 | 193
Impaired loans, related allowances | 5 | 5
Impaired loans, carrying amount | 189 | 193
Impaired loans, unpaid principal balance | 189 | 193
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 |  |
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 | 535 | 549
Impaired loans with an allowance recorded, unpaid principal balance | 535 | 549
Impaired loans, related allowances | 55 | 107
Impaired loans, carrying amount | 535 | 549
Impaired loans, unpaid principal balance | 535 | 549
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 | 70 |
Impaired loans with an allowance recorded, unpaid principal balance | 70 |
Impaired loans, related allowances | 72 |
Impaired loans, carrying amount | 70 |
Impaired loans, unpaid principal balance | $ 70 |

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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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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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- Definition Amount of investment in impaired financing receivables for which there is no 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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