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Note 3 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position - USD ($) $ in Thousands | Jun. 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 | $ 128,010 | $ 56,619
Less than 12 Months Unrealized Losses | 1,405 | 242
12 Months or Greater Estimated Fair Value | 70,155 | 98,693
12 Months or Greater Unrealized Losses | 1,625 | 2,435
Total Estimated Fair Value | 198,165 | 155,312
Total Unrealized Losses | 3,030 | 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 | 25,511 | 2,001
Less than 12 Months Unrealized Losses | 294 | 7
12 Months or Greater Estimated Fair Value |  | 1,750
12 Months or Greater Unrealized Losses |  | 33
Total Estimated Fair Value | 25,511 | 3,751
Total Unrealized Losses | 294 | 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 | 59,378 | 49,644
Less than 12 Months Unrealized Losses | 425 | 221
12 Months or Greater Estimated Fair Value | 70,155 | 86,028
12 Months or Greater Unrealized Losses | 1,625 | 2,295
Total Estimated Fair Value | 129,533 | 135,672
Total Unrealized Losses | 2,050 | 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 | 31,814 | 4,974
Less than 12 Months Unrealized Losses | 627 | 14
12 Months or Greater Estimated Fair Value |  | 10,915
12 Months or Greater Unrealized Losses |  | 107
Total Estimated Fair Value | 31,814 | 15,889
Total Unrealized Losses | 627 | $ 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 | 11,307 |
Less than 12 Months Unrealized Losses | 59 |
Total Estimated Fair Value | 11,307 |
Total Unrealized Losses | $ 59 |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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