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Note 20 - Fair Value Measurement - Financial Assets and Financial Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Available for sale, fair value | $ 1,068,825 | $ 1,161,400
US Treasury Securities [Member] |  |
Available for sale, fair value | 522,923 | 617,486
US Government Agencies Debt Securities [Member] |  |
Available for sale, fair value |  | 219,274
Collateralized Mortgage-Backed Securities [Member] |  |
Available for sale, fair value | 133,304 | 9,517
Corporate Debt Securities [Member] |  |
Available for sale, fair value | 402,789 | 315,123
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale, fair value | 9,809 |
Fair Value, Recurring [Member] |  |
Available for sale, fair value | 1,068,825 | 1,161,400
Total assets at fair value | 1,068,825 | 1,161,400
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Available for sale, fair value | 522,923 | 617,486
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Available for sale, fair value |  | 219,274
Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Available for sale, fair value | 133,304 | 9,517
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Available for sale, fair value | 402,789 | 315,123
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale, fair value | 9,809 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Available for sale, fair value | 522,923 | 617,486
Total assets at fair value | 522,923 | 617,486
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Available for sale, fair value | 522,923 | 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] | Corporate Debt 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 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Available for sale, fair value | 545,902 | 543,914
Total assets at fair value | 545,902 | 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 |  | 219,274
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] |  |
Available for sale, fair value | 133,304 | 9,517
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Available for sale, fair value | 402,789 | 315,123
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale, fair value | 9,809 |
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] | Corporate Debt 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 |

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