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Note 2 - Investments - Summary of Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Interest income	$ 14,515	$ 9,365	$ 39,824	$ 24,317
Dividend income	298	220	857	675
Investment income (expense)	(241)	(177)	(667)	(486)
Net investment income	$ 14,572	$ 9,408	$ 40,014	$ 24,506

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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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