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Note 19 - Fair Value of Financial Instruments and Fair Value Measurements - Quantitative Information About Recurring Level 3 Fair Value Measurement (Details) $ in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | ---
Fair Value |  | $ 347,332 | $ 353,066
Corporate Debt Securities [Member] |  |  |
Fair Value |  | 2,806 | 2,872
Fair Value, Recurring [Member] |  |  |
Fair Value |  | 347,332 | 353,066
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value |  | 2,022 | 2,009
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value |  | 2,806 | 2,872
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value |  | 2,022 | 2,009
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |
Fair Value |  | $ 2,022 | $ 2,009
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Weighted Average [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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