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Note 3 - Investment Securities (Details) | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Number of Securities | 470 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 136 |  |
Aggregate Depreciation from Amortized Cost Basis, Percent | 1.00% |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | 49 |  |
Other than Temporary Impairment Losses, Investments (in Dollars) |  | $ 0 | $ 0
Security Owned and Pledged as Collateral, Fair Value (in Dollars) | $ 248,277,471 | $ 402,507,865 |
Equity Securities [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Percentage of Investment Portfolio | 1.00% | 1.00% |
Debt Securities [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Other than Temporary Impairment Losses, Investments (in Dollars) | $ 0 |  |
Revenue Bonds [Member] | Municipal Bonds [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Number of Issuers | 82 | 64 |
Other Investments (in Dollars) | $ 214,400,000 | $ 161,700,000 |
Number of States Investments Held In | 9 | 8 |
Revenue Bonds [Member] | Municipal Bonds [Member] | Aggregate Fair Value Exceeding $5 Million [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Number of States Investments Held In | 4 | 4 |
General Obligation Bonds [Member] | Municipal Bonds [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Number of Issuers | 92,000,000 | 77 |
Other Investments (in Dollars) | $ 67,800,000 | $ 68,800,000 |
Number of States Investments Held In | 19 | 19 |
General Obligation Bonds [Member] | Municipal Bonds [Member] | Aggregate Fair Value Exceeding $5 Million [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Number of States Investments Held In | 4 | 3 |
General Obligation Bonds [Member] | Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 0.00% | 0.00% |
Minimum [Member] | Revenue Bonds [Member] | Municipal Bonds [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Other Investments (in Dollars) | $ 5,000,000 | $ 5,000,000 |
Minimum [Member] | General Obligation Bonds [Member] | Municipal Bonds [Member] |  |  |
Note 3 - Investment Securities (Details) [Line Items] |  |  |
Other Investments (in Dollars) | $ 5,000,000 | $ 5,000,000 |

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