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Note 12 - Fair Value Measurement - Financial Assets and Financial Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available for sale, fair value | $ 1,227,851 | $ 1,161,400 | [1]
US Treasury Securities [Member] |  |  |
Available for sale, fair value | 701,482 | 617,486 |
Collateralized Mortgage-Backed Securities [Member] |  |  |
Available for sale, fair value | 178,151 | 219,274 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Available for sale, fair value | 9,639 | 9,517 |
Corporate Debt Securities [Member] |  |  |
Available for sale, fair value | 338,579 | 315,123 |
Fair Value, Recurring [Member] |  |  |
Available for sale, fair value | 1,227,851 | 1,161,400 |
Total assets at fair value | 1,227,851 | 1,161,400 |
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Available for sale, fair value | 701,482 | 617,486 |
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |  |
Available for sale, fair value |  | 0 |
Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |  |
Available for sale, fair value | 178,151 | 219,274 |
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available for sale, fair value | 9,639 | 9,517 |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available for sale, fair value | 338,579 | 315,123 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Available for sale, fair value | 701,482 | 617,486 |
Total assets at fair value | 701,482 | 617,486 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Available for sale, fair value | 701,482 | 617,486 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |  |
Available for sale, fair value |  | 0 |
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 | 526,369 | 543,914 |
Total assets at fair value | 526,369 | 543,914 |
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] | US Government Agencies Debt Securities [Member] |  |  |
Available for sale, fair value |  | 0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |  |
Available for sale, fair value | 178,151 | 219,274 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available for sale, fair value | 9,639 | 9,517 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available for sale, fair value | 338,579 | 315,123 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Available for sale, fair value | 0 | 0 |
Total assets at fair value | 0 | 0 |
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] | US Government Agencies Debt Securities [Member] |  |  |
Available for sale, fair value |  | 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 | $ 0 |
[1] | Derived from audited financial statements.

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