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Note 3 - Investment Securities (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Number of Securities | 544 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 354 |  |
Aggregate Depreciation From Amortized Cost Basis, Percent | 5.00% |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | 16 |  |
Available-for-sale Securities Pledged as Collateral | $ 497,286,275 | $ 384,194,020 |
Equity Securities [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Percentage of Investment Portfolio | 1.00% | 1.00% |
Other than Temporary Impairment Losses, Investments | 0 | 62,400 | 118,847
Debt Securities [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Other than Temporary Impairment Losses, Investments | $ 0 | $ 0 | $ 0

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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + 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 (b)(3) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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