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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 | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Average Recorded Investment | $ 2,170 | $ 7,117
Interest Income Recognized | 88 | 119
Interest Income Received | 84 | 122
Real Estate [Member] |  |
Average Recorded Investment |  | 264
Interest Income Recognized |  | 26
Interest Income Received |  | 26
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] |  |
Average Recorded Investment | 1,381 | 1,493
Interest Income Recognized | 41 | 44
Interest Income Received | 39 | 46
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] |  |
Average Recorded Investment | 232 | 139
Interest Income Recognized | 14 | 14
Interest Income Received | 14 | 14
Real Estate [Member] | Secured by Multi-family Residential Properties [Member] |  |
Average Recorded Investment |  | 1,892
Interest Income Recognized |  |
Interest Income Received |  |
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] |  |
Average Recorded Investment | 557 | 3,329
Interest Income Recognized | 33 | 35
Interest Income Received | 31 | $ 36
Commercial and Industrial Loans [Member] |  |
Average Recorded Investment |  |
Interest Income Recognized |  |
Interest Income Received |  |

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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=66008989&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=66008989&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=66008989&loc=d3e5212-111524 + Details
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