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Note 3 - Investments - Summary of Net Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Interest income	$ 55,164	$ 35,433	$ 23,349
Dividend income	1,869	1,075	871
Investment expense	(1,028)	(684)	(515)
Net investment income	$ 56,005	$ 35,824	$ 23,705

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Amount of dividend income on nonoperating securities.

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