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Note 2 - Investment Securities (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |  |
Number of Securities | 479 |  | 479 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 223 |  | 223 |  |
Aggregate Depreciation from Amortized Cost Basis, Percent |  |  | 1.50% |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | 61 |  | 61 |  |
Equity Securities [Member] |  |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |  |
Percentage of Investment Portfolio | 1.00% |  | 1.00% |  | 1.00%
Other than Temporary Impairment Losses, Investments (in Dollars) | $ 0 | $ 0 | $ 0 | $ 0 |
Debt Securities [Member] |  |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |  |
Other than Temporary Impairment Losses, Investments (in Dollars) | $ 0 | $ 0 | $ 0 | $ 0 |
General Obligation Bonds [Member] | Municipal Bonds [Member] |  |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |  |
Number of Issuers | 78 |  | 78 |  | 77
Other Investments (in Dollars) | $ 57,300,000 |  | $ 57,300,000 |  | $ 68,800,000
Number of States Investments Held In | 18 |  | 18 |  | 19
General Obligation Bonds [Member] | Municipal Bonds [Member] | Aggregate Fair Value Exceeding $5 Million [Member] |  |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |  |
Number of States Investments Held In | 3 |  | 3 |  | 3
General Obligation Bonds [Member] | Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member] |  |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  | 0.00% |  | 0.00%
Revenue Bonds [Member] | Municipal Bonds [Member] |  |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |  |
Number of Issuers | 81 |  | 81 |  | 64
Other Investments (in Dollars) | $ 193,100,000 |  | $ 193,100,000 |  | $ 161,700,000
Number of States Investments Held In | 8 |  | 8 |  | 8
Revenue Bonds [Member] | Municipal Bonds [Member] | Aggregate Fair Value Exceeding $5 Million [Member] |  |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |  |
Number of States Investments Held In | 4 |  | 4 |  | 4
Revenue Bonds [Member] | Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member] |  |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  | 0.00% |  | 0.00%
Minimum [Member] | General Obligation Bonds [Member] | Municipal Bonds [Member] |  |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |  |
Other Investments (in Dollars) | $ 5,000,000 |  | $ 5,000,000 |  | $ 5,000,000
Minimum [Member] | Revenue Bonds [Member] | Municipal Bonds [Member] |  |  |  |  |
Note 2 - Investment Securities (Details) [Line Items] |  |  |  |  |
Other Investments (in Dollars) | $ 5,000,000 |  | $ 5,000,000 |  |
Number of States Investments Held In |  |  |  |  | 5,000,000

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