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Note 4 - Loans and Allowance for Loan Losses - Average Net Investment Impaired Loans and Interest Income Recognized and Received on Impaired Loans (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Impaired loans, average recorded investment | $ 1,968 | $ 2,170
Impaired loans, interest income recognized | 44 | 88
Impaired loans, interest income received | 40 | 84
Real Estate [Member] |  |
Impaired loans, average recorded investment |  |
Impaired loans, interest income recognized |  |
Impaired loans, interest income received |  |
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] |  |
Impaired loans, average recorded investment | 1,183 | 1,381
Impaired loans, interest income recognized | 1 | 41
Impaired loans, interest income received | 1 | 39
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] |  |
Impaired loans, average recorded investment | 191 | 232
Impaired loans, interest income recognized | 10 | 14
Impaired loans, interest income received | 11 | 14
Real Estate [Member] | Secured by Multi-family Residential Properties [Member] |  |
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, average recorded investment | 539 | 557
Impaired loans, interest income recognized | 27 | 33
Impaired loans, interest income received | 25 | $ 31
Commercial and Industrial Loans [Member] |  |
Impaired loans, average recorded investment | 55 |
Impaired loans, interest income recognized | 6 |
Impaired loans, interest income received | $ 3 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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