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Note 4 - Loans and Related Allowance for Loan Losses (Details) - Troubled Debt Restructurings $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Commercial and Industrial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | 6 |  | 7
Pre-modification outstanding recorded investment (in Dollars) | $ 434 |  | $ 1,264
Post-modification outstanding recorded investment (in Dollars) | $ 434 |  | $ 1,264
Commercial and Industrial [Member] | Extended Maturity [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | 6 |  | 6
Commercial and Industrial [Member] | Other Restructurings [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts |  |  | 1
Real Estate Construction Porfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | 1 |  |
Pre-modification outstanding recorded investment (in Dollars) | $ 181 |  |
Post-modification outstanding recorded investment (in Dollars) | $ 181 |  |
Real Estate Construction Porfolio Segment [Member] | Extended Maturity [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | 1 |  |
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | 6 | 3 | 7
Pre-modification outstanding recorded investment (in Dollars) | $ 515 | $ 140 | $ 784
Post-modification outstanding recorded investment (in Dollars) | $ 535 | $ 140 | $ 784
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Extended Maturity [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | 5 | 3 | 7
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Other Restructurings [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | 1 |  |
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | 1 | 1 | 2
Pre-modification outstanding recorded investment (in Dollars) | $ 270 | $ 48 | $ 834
Post-modification outstanding recorded investment (in Dollars) | $ 270 | $ 48 | $ 834
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] | Extended Maturity [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | 1 | 1 | 2
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts |  | 1 |
Pre-modification outstanding recorded investment (in Dollars) |  | $ 6 |
Post-modification outstanding recorded investment (in Dollars) |  | $ 6 |
Consumer Portfolio Segment [Member] | Extended Maturity [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts |  | 1 |

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