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Note 11 - Fair Value Measurement - Financial Assets and Financial Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available for sale, fair value | $ 1,073,929 | $ 900,183 | [1]
US Treasury Securities [Member] |  |  |
Available for sale, fair value | 493,969 | 340,807 |
Collateralized Mortgage-Backed Securities [Member] |  |  |
Available for sale, fair value | 254,915 | 215,485 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Available for sale, fair value | 9,958 | 10,223 |
Corporate Debt Securities [Member] |  |  |
Available for sale, fair value | 315,086 | 333,667 |
Fair Value, Recurring [Member] |  |  |
Available for sale, fair value | 1,073,929 | 900,183 |
Total assets at fair value | 1,073,929 | 900,183 |
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Available for sale, fair value | 493,969 | 340,807 |
Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |  |
Available for sale, fair value | 254,915 | 215,485 |
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available for sale, fair value | 9,958 | 10,223 |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available for sale, fair value | 315,086 | 333,668 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Available for sale, fair value | 493,969 | 340,807 |
Total assets at fair value | 493,969 | 340,807 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Available for sale, fair value | 493,969 | 340,807 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |  |
Available for sale, fair value | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available for sale, fair value | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available for sale, fair value | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Available for sale, fair value | 579,959 | 552,516 |
Total assets at fair value | 579,959 | 552,516 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Available for sale, fair value | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |  |
Available for sale, fair value | 254,915 | 215,485 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available for sale, fair value | 9,958 | 10,223 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available for sale, fair value | 315,086 | 326,808 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Available for sale, fair value | 0 | 6,860 |
Total assets at fair value | 0 | 6,860 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Available for sale, fair value | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |  |
Available for sale, fair value | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available for sale, fair value | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available for sale, fair value | $ 0 | $ 6,860 |
[1] | derived from audited financial statements.

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