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Note 2 - Investment Securities (Details Textual) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Equity Securities [Member] |  |  |  |  |
Percentage of Investment Portfolio | 1.00% |  | 1.00% |  | 1.00%
Other than Temporary Impairment Losses, Investments | $ 0 | $ 0 |  |  |
Debt Securities [Member] |  |  |  |  |
Other than Temporary Impairment Losses, Investments |  |  | $ 0 | $ 0 |
Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member] | General Obligation Bonds [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 0.00% |  | 0.00%
Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member] | Revenue Bonds [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 0.00% |  | 0.00%
General Obligation Bonds [Member] | Municipal Bonds [Member] | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |  |  |
Number of States Investments Held in | 4 |  | 4 |  | 4
General Obligation Bonds [Member] | Municipal Bonds [Member] | Minimum [Member] |  |  |  |  |
Other Investments | $ 5,000,000 |  | $ 5,000,000 |  | $ 5,000,000
General Obligation Bonds [Member] | Municipal Bonds [Member] |  |  |  |  |
Number of Issuers | 77 |  | 77 |  | 82
Other Investments | $ 69,000,000 |  | $ 69,000,000 |  | $ 67,800,000
Number of States Investments Held in | 19 |  | 19 |  | 19
Revenue Bonds [Member] | Municipal Bonds [Member] | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |  |  |
Number of States Investments Held in | 4 |  | 4 |  | 4
Revenue Bonds [Member] | Municipal Bonds [Member] | Minimum [Member] |  |  |  |  |
Other Investments | $ 5,000,000 |  | $ 5,000,000 |  | $ 5,000,000
Revenue Bonds [Member] | Municipal Bonds [Member] |  |  |  |  |
Number of Issuers | 99 |  | 99 |  | 92
Other Investments | $ 239,100,000 |  | $ 239,100,000 |  | $ 214,400,000
Number of States Investments Held in | 9 |  | 9 |  | 9
Number of Securities | 447 |  | 447 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 30 |  | 30 |  |
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 | 17 |  | 17 |  |

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