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Note 3 - Investment Securities Available-for-Sale (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Note 3 - Investment Securities Available-for-Sale (Details) [Line Items] |  |  |
Federal Home Loan Bank Stock and Federal Reserve Bank Stock | $ 16,865,000 | $ 10,657,000 | $ 22,560,000
Debt Securities, Weighted Average Duration | 3 years 255 days |  |
Available-for-sale Securities, Gross Realized Gains | $ 2,500,000 | 116,000 |
Available-for-sale Securities, Gross Realized Losses | 294,000 | 106,000 |
Proceeds from Sale of Available-for-sale Securities | 65,800,000 | $ 17,500,000 |
Available-for-sale Securities Pledged as Collateral | 450,500,000 |  |
Securities Holdings of any One Issuer Exceeding 10% of Shareholders' Equity | $ 0 |  | $ 0
Debt Securities [Member] | Total Investment Securities [Member] | Investment Securities Concentration Risk [Member] |  |  |
Note 3 - Investment Securities Available-for-Sale (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 99.90% |  |

X
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