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Note 2 - Investments - Summary of Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Interest income	$ 13,344	$ 7,626	$ 25,308	$ 14,952
Dividend income	242	257	559	455
Investment income (expense)	(216)	77	(426)	(309)
Net investment income	$ 13,370	$ 7,960	$ 25,441	$ 15,098

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Amount of income (expenses) related to the generation of investment income.

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Amount of dividend income on nonoperating securities.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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