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Note 7 - Fair Value Measurements and Fair Value of Financial Instruments - Quantitative Information About Significant Unobservable Inputs (Details) $ in Thousands | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | ---
Obligations of U.S. states and political subdivisions | $ 1,227,200 | $ 612,847
Fair Value, Recurring [Member] |  |
Obligations of U.S. states and political subdivisions | 1,227,200 | 612,847
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Obligations of U.S. states and political subdivisions | 6,579 | 6,526
US States and Political Subdivisions Debt Securities [Member] |  |
Obligations of U.S. states and political subdivisions | 207,126 | 122,404
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Obligations of U.S. states and political subdivisions | 207,126 | 122,404
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Obligations of U.S. states and political subdivisions | $ 6,579 | $ 6,526
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] |  |
Obligations of U.S. states and political subdivisions | 0.047 | 0.05

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