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Note 7 - Troubled Debt Restructurings Subsequently Defaulted (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($)
Commercial And Industrial [Member] |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  |  | 1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment |  |  | $ 48,000
Real Estate Construction Porfolio Segment [Member] |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  |  | 1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment |  |  | $ 14,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 1 | 1 |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 270,000 | $ 270,000 |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953682-111524 + Details
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