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Note 2 - Investments (Details Textual) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2025 USD ($) FixedMaturitySecurities	Jun. 30, 2025 USD ($) FixedMaturitySecurities	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) FixedMaturitySecurities
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | FixedMaturitySecurities	491	491		595
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 495,170	$ 495,170		$ 663,972
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	26,695	26,695		37,257
Proceeds from Sale of Debt Securities, Available-for-Sale	3,000	8,800	$ 2,200
Proceeds from Sale of Equity Securities, FV-NI	4,600	6,400
Debt Securities, Available-for-sale	1,113,366	1,113,366		939,046
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	74,400	74,400
Securities on Deposit With State Regulatory Authorities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale	$ 12,400	$ 12,400		$ 9,900

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