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Note 4 - Loans and Allowance for Loan Losses - Number of Loans Modified Troubled Debt Restructuring by Loan Portfolio (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Number of Loans | Security Loan | 8 | 11
Pre-Modification Oustanding Principal Balance | $ 2,447 | $ 2,649
Post-Modification Principal Balance | $ 1,664 | $ 1,947
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] |  |
Number of Loans | Security Loan | 2 | 3
Pre-Modification Oustanding Principal Balance | $ 1,960 | $ 2,220
Post-Modification Principal Balance | $ 1,286 | $ 1,698
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] |  |
Number of Loans | Security Loan | 3 | 4
Pre-Modification Oustanding Principal Balance | $ 318 | $ 200
Post-Modification Principal Balance | $ 249 | $ 103
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] |  |
Number of Loans | Security Loan | 1 | 2
Pre-Modification Oustanding Principal Balance | $ 53 | $ 113
Post-Modification Principal Balance | $ 41 | $ 52
Commercial and Industrial Loans [Member] |  |
Number of Loans | Security Loan | 2 | 2
Pre-Modification Oustanding Principal Balance | $ 116 | $ 116
Post-Modification Principal Balance | $ 88 | $ 94

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524 + Details
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