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Note 2 - Investment Securities (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |
Number of Securities | 505 | 505 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  |  |  | 241
Aggregate Depreciation From Amortized Cost Basis, Percent |  | 3.00% |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | 190 | 190 |  |
Available-for-sale Securities | $ 466,944,567 | $ 466,944,567 |  | $ 551,758,458
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment | 185,840,139 | 185,840,139 |  | 145,451,895
Number of Issuers | 272 | 272 |  | 269
Municipal Bonds [Member] | General Obligation Bonds [Member] |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |
Other Investments | 63,200,000 | 63,200,000 |  | 54,200,000
Municipal Bonds [Member] | Revenue Bonds [Member] |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |
Other Investments | 153,000,000 | 153,000,000 |  | 119,300,000
Equity Securities [Member] |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |
Percentage of Investment Portfolio |  | 1.00% |  | 1.00%
Other than Temporary Impairment Losses, Investments | 0 | 0 | 0 |
Debt Securities [Member] |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |
Other than Temporary Impairment Losses, Investments | 0 | 0 | 0 |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |
Available-for-sale Securities | 31,260,146 | 31,260,146 |  | 35,958,857
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment | 184,790,139 | 184,790,139 |  | 144,401,895
Aggregate Fair Value Exceeding $5 Million [Member] | General Obligation Bonds [Member] |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |
Number of States Investments Held In | 3 | 3 |  | 2
Aggregate Fair Value Exceeding $5 Million [Member] | Revenue Bonds [Member] |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |
Number of States Investments Held In | 4 | 4 |  | 4
General Obligation Bonds [Member] | Minimum [Member] |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |
Other Investments | 5,000,000 | 5,000,000 |  | 5,000,000
General Obligation Bonds [Member] |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |
Number of States Investments Held In | 19 | 19 |  | 20
Revenue Bonds [Member] | Minimum [Member] |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |
Other Investments | $ 5,000,000 | $ 5,000,000 |  | $ 5,000,000
Revenue Bonds [Member] |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |
Number of States Investments Held In | 8 | 8 |  | 8

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