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Note 3 - Investment Securities Available-for-Sale (Details) - USD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014
Note 3 - Investment Securities Available-for-Sale (Details) [Line Items] |  |  |
Debt Securities, Weighted Average Duration | 3 years 328 days |  |
Federal Home Loan Bank Stock and Federal Reserve Bank Stock | $ 16,828,000 | $ 22,560,000 | $ 10,626,000
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 | 65,700,000 | 17,500,000 |
Available-for-sale Securities Pledged as Collateral | 368,500,000 |  |
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% |  |

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