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Note 4 - Investment Securities Available-for-Sale (Details) (USD $) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013
Note 4 - Investment Securities Available-for-Sale (Details) [Line Items] |  |  |
Debt Securities Weighted Average Duration | 4 years 36 days |  |
Federal Home Loan Bank Stock and Federal Reserve Bank Stock (in Dollars) | $ 10,657,000 | $ 11,272,000 | $ 11,246,000
Available-for-sale Securities Pledged as Collateral (in Dollars) | $ 262,500,000 |  |
Percent Of Shareholders' Equity | 10.00% | 10.00% |
Debt Securities [Member] | Total Investment Securities [Member] | Investment Securities Concentration Risk [Member] |  |  |
Note 4 - Investment Securities Available-for-Sale (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 99.90% |  |

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