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Note 2 - Investment Securities (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Number of Securities | 568 |  | 568 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 212 |  | 212 |  |
Aggregate Depreciation from Amortized Cost Basis, Percent |  |  | 0.90% |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | 30 |  | 30 |  |
General Obligation Bonds [Member] | Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 0.00% |  | 0.00%
Revenue Bonds [Member] | Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 0.00% |  | 0.00%
Municipal Bonds [Member] | General Obligation Bonds [Member] |  |  |  |  |
Number of Issuers | 124 |  | 124 |  | 116
Number of States Investments Held in | 21 |  | 21 |  | 21
Other Investments | $ 107,900 |  | $ 107,900 |  | $ 116,500
Municipal Bonds [Member] | General Obligation Bonds [Member] | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |  |  |
Number of States Investments Held in |  |  |  |  | 5
Municipal Bonds [Member] | General Obligation Bonds [Member] | Minimum [Member] |  |  |  |  |
Number of States Investments Held in | 6 |  | 6 |  |
Other Investments | $ 5,000 |  | $ 5,000 |  | $ 5,000
Municipal Bonds [Member] | Revenue Bonds [Member] |  |  |  |  |
Number of Issuers | 126 |  | 126 |  | 120
Number of States Investments Held in | 13 |  | 13 |  | 12
Other Investments | $ 272,200 |  | $ 272,200 |  | $ 255,500
Municipal Bonds [Member] | Revenue Bonds [Member] | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |  |  |
Number of States Investments Held in | 6 |  | 6 |  | 6
Municipal Bonds [Member] | Revenue Bonds [Member] | Minimum [Member] |  |  |  |  |
Other Investments | $ 5,000 |  | $ 5,000 |  | $ 5,000
Equity Securities [Member] |  |  |  |  |
Percentage of Investment Portfolio | 1.00% |  | 1.00% |  | 1.00%
Debt Securities [Member] |  |  |  |  |
Other than Temporary Impairment Losses, Investments | $ 0 | $ 0 | $ 0 | $ 0 |

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