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Note 3 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Note 3 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items] |  |
Less than 12 Months Estimated Fair Value | $ 99,982 | $ 56,619
Less than 12 Months Unrealized Losses | 445 | 242
12 Months or Greater Estimated Fair Value | 61,610 | 98,693
12 Months or Greater Unrealized Losses | 948 | 2,435
Total Estimated Fair Value | 161,592 | 155,312
Total Unrealized Losses | 1,393 | 2,677
US Government Agencies Debt Securities [Member] |  |
Note 3 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items] |  |
Less than 12 Months Estimated Fair Value | 13,966 | 2,001
Less than 12 Months Unrealized Losses | 90 | 7
12 Months or Greater Estimated Fair Value |  | 1,750
12 Months or Greater Unrealized Losses |  | 33
Total Estimated Fair Value | 13,966 | 3,751
Total Unrealized Losses | 90 | 40
Residential Mortgage Backed Securities [Member] |  |
Note 3 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items] |  |
Less than 12 Months Estimated Fair Value | 58,925 | 49,644
Less than 12 Months Unrealized Losses | 182 | 221
12 Months or Greater Estimated Fair Value | 61,610 | 86,028
12 Months or Greater Unrealized Losses | 948 | 2,295
Total Estimated Fair Value | 120,535 | 135,672
Total Unrealized Losses | 1,130 | 2,516
US States and Political Subdivisions Debt Securities [Member] |  |
Note 3 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items] |  |
Less than 12 Months Estimated Fair Value | 12,073 | 4,974
Less than 12 Months Unrealized Losses | 95 | 14
12 Months or Greater Estimated Fair Value |  | 10,915
12 Months or Greater Unrealized Losses |  | 107
Total Estimated Fair Value | 12,073 | 15,889
Total Unrealized Losses | 95 | $ 121
Corporate Debt Securities [Member] |  |
Note 3 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items] |  |
Less than 12 Months Estimated Fair Value | 15,018 |
Less than 12 Months Unrealized Losses | 78 |
Total Estimated Fair Value | 15,018 |
Total Unrealized Losses | $ 78 |

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