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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 | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | ---
Fair Value |  | $ 409,839 | $ 353,066
Fair Value, Recurring [Member] |  |  |
Fair Value |  | 409,839 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value |  |  | 4,277
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value |  | 3,434 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Fair Value |  | 3,574 | 3,989
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value |  | 3,574 | 3,989
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value |  | $ 215 | 214
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Measurement Input, Discount Rate [Member] |  |  |
Range Weighted Average | [1] |  |
US Government Agencies Debt Securities [Member] |  |  |
Fair Value |  | $ 403,408 | 346,205
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value |  | 403,408 | 346,205
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value |  | $ 3,219 | $ 4,063
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, 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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