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Note 7 - Loans and Related Allowance for Loan Losses - Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($)
Commercial And Industrial [Member] |  |  |  |
Pre-modification outstanding recorded investment | $ 904 | $ 3 | $ 954 | $ 169
Post-modification outstanding recorded investment | $ 905 | $ 3 | $ 955 | $ 169
Number of contracts | 1 | 1 | 2 | 2
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |  |  |
Pre-modification outstanding recorded investment | $ 7 | $ 58 | $ 10 | $ 58
Post-modification outstanding recorded investment | $ 7 | $ 58 | $ 10 | $ 58
Number of contracts | 1 | 1 | 2 | 1
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Pre-modification outstanding recorded investment |  | $ 311 |  | $ 311
Post-modification outstanding recorded investment |  | $ 311 |  | $ 311
Number of contracts |  | 1 |  | 1
Extended Maturity [Member] | Commercial And Industrial [Member] |  |  |  |
Number of contracts |  | 1 | 1 | 2
Extended Maturity [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |  |  |
Number of contracts | 1 | 1 | 2 | 1
Extended Maturity [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Number of contracts |  | 1 |  | 1
Other Restructurings [Member] | Commercial And Industrial [Member] |  |  |  |
Number of contracts | 1 |  | 1 |
Other Restructurings [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |  |  |
Number of contracts |  |  |  |
Other Restructurings [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Number of contracts |  |  |  |

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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=84173941&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=84173941&loc=SL6953676-111524 + Details
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