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Note 7 - Loans - Non-accrual Troubled Debt Restructurings (Details) - Non-accruing Troubled Debt Restructuring [Member] - USD ($) $ in Thousands | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014
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Commercial Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | $ 3,477 |  | $ 1,033 |  |  |
Commercial Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 90 |  | 90 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs | 3,567 |  | 1,123 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 1,508 |  | 1,544 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 15,260 |  | 20,362 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs | 16,768 |  | 21,906 |  |  |
Real Estate Construction Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs |  |  | 9,981 |  |  |
Real Estate Construction Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs |  |  | 5,825 |  |  |
Real Estate Construction Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs |  |  | 15,806 |  |  |
Residential Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 364 |  | 388 |  |  |
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 171 |  | 700 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Accruing TDRs | 535 |  | 1,088 |  |  |
Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 5,349 |  | 12,946 |  |  |
Rate Reduction and Payment Deferral [Member] |  |  |  |  |  |
Accruing TDRs | 15,521 |  | 26,977 |  |  |
Accruing TDRs | $ 20,870 | $ 25,442 | $ 39,923 | $ 41,806 | $ 42,595 | $ 41,618

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- Definition The amount of the outstanding recorded investment related to 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 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Recorded Investment -URI http://asc.fasb.org/extlink&oid=65880944 + Details
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