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Note 21 - Fair Value Measurement - Financial Assets and Financial Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Available for sale, fair value | $ 1,161,400 | $ 900,183 |
US Treasury Securities [Member] |  |  |
Available for sale, fair value | 617,486 | 340,807 |
US Government Agencies Debt Securities [Member] |  |  |
Available for sale, fair value |  | 215,485 |
Collateralized Mortgage-Backed Securities [Member] |  |  |
Available for sale, fair value | 219,274 | 10,223 |
Corporate Debt Securities [Member] |  |  |
Available for sale, fair value | $ 315,123 | 333,668 |
Fair Value, Recurring [Member] |  |  |
Available for sale, fair value |  | 1,161,400 | $ 900,183
Total assets at fair value |  | 1,161,400 | 900,183
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Available for sale, fair value |  | 617,486 | 340,807
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |  |
Available for sale, fair value |  | 219,274 | 215,485
Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |  |
Available for sale, fair value |  | 9,517 | 10,223
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available for sale, fair value |  | 315,123 | 333,668
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Available for sale, fair value |  | 617,486 | 340,807
Total assets at fair value |  | 617,486 | 340,807
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Available for sale, fair value |  | 617,486 | 340,807
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |  |
Available for sale, fair value |  | 0 | 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] | 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 |  | 543,914 | 552,516
Total assets at fair value |  | 543,914 | 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] | US Government Agencies Debt Securities [Member] |  |  |
Available for sale, fair value |  | 219,274 | 215,485
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |  |
Available for sale, fair value |  | 9,517 | 10,223
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available for sale, fair value |  | 315,123 | 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] | US Government Agencies Debt 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] | Corporate Debt Securities [Member] |  |  |
Available for sale, fair value |  | $ 0 | $ 6,860

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