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Note 2 - Investment Securities (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Number of Securities | 604 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total | 290 |  |
Aggregate Depreciation from Amortized Cost Basis, Percent | 1.80% |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | 105 |  |
Other than Temporary Impairment Losses, Investments, Total | $ 0 | $ 0 |
Proceeds from Sale and Maturity of Marketable Securities, Total | $ 0 | $ 0 |
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 | 128 |  | 131
Other Investments, Total | $ 101,300 |  | $ 108,000
Number of States Investments Held in | 26 |  | 26
Municipal Bonds [Member] | General Obligation Bonds [Member] | Minimum [Member] |  |  |
Other Investments, Total | $ 5,000 |  | $ 5,000
Municipal Bonds [Member] | General Obligation Bonds [Member] | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |
Number of States Investments Held in | 6 |  | 6
Municipal Bonds [Member] | Revenue Bonds [Member] |  |  |
Number of Issuers | 148 |  | 145
Other Investments, Total | $ 334,600 |  | $ 337,300
Number of States Investments Held in | 16 |  | 16
Municipal Bonds [Member] | Revenue Bonds [Member] | Minimum [Member] |  |  |
Other Investments, Total | $ 5,000 |  | $ 5,000
Municipal Bonds [Member] | Revenue Bonds [Member] | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |
Number of States Investments Held in | 7 |  | 7

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