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Note 11 - Fair Value of Financial Instruments and Fair Value Measurements - Quantitative Information About Recurring Level 3 Fair Value Measurement (Details) $ in Thousands | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | ---
Fair Value |  | $ 318,032 | $ 354,247
Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | 318,032 | 354,247
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | 6,630 | 7,298
US States and Political Subdivisions Debt Securities [Member] |  |  |
Fair Value |  | 3,972 | 4,493
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | 3,972 | 4,493
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | $ 215 | 216
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate [Member] |  |  |
Range Weighted Average | [1] |  |
US Government Agencies Debt Securities [Member] |  |  |
Fair Value |  | $ 311,178 | 346,723
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | 311,178 | 346,723
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | $ 4,415 | 5,022
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate [Member] |  |  |
Range Weighted Average | [1] |  |
Corporate Debt Securities [Member] |  |  |
Fair Value |  | $ 2,882 | 2,060
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | 2,882 | 2,060
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | $ 2,000 | $ 2,060
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate [Member] |  |  |
Range Weighted Average | [1] |  |
[1] | The Company relies on a third-party pricing service to value its securities. The details of the unobservable inputs and other adjustments used by the third-party pricing service were not readily available to the Company.

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