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Note 7 - Fair Value Measurements and Fair Value of Financial Instruments - Quantitative Information About Significant Unobservable Inputs (Details) $ in Thousands	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Obligations of U.S. states and political subdivisions	$ 1,252,202	$ 612,847
Fair Value, Recurring [Member]
Obligations of U.S. states and political subdivisions	1,252,202	612,847
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Obligations of U.S. states and political subdivisions	6,572	6,526
US States and Political Subdivisions Debt Securities [Member]
Obligations of U.S. states and political subdivisions	211,765	122,404
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Obligations of U.S. states and political subdivisions	211,765	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	$ 6,572	$ 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	0.046	0.05

X

- Definition

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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- Definition

Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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