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Note 4 - Loans and Related Allowance for Loan Losses (Details) - Troubled Debt Restructurings Subsequently Defaulted $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Commercial and Industrial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | 2 |  | 5
Recorded investment | $ 14 |  | $ 574
Real Estate Construction Porfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | 1 |  |
Recorded investment | $ 130 |  |
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts |  | 1 |
Recorded investment |  | $ 15 |
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts |  |  | 1
Recorded investment |  |  | $ 190

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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=49124121&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=49124121&loc=SL6953682-111524 + Details
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