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Note 2 - Investments (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) FixedMaturitySecurities	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) FixedMaturitySecurities	Sep. 30, 2024 USD ($)	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	390		390		595
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 368,799		$ 368,799		$ 663,972
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	21,005		21,005		37,257
Proceeds from Sale of Debt Securities, Available-for-Sale	10,700	$ 3,200	19,500	$ 5,400
Proceeds from Sale of Equity Securities, FV-NI			6,400
Debt Securities, Available-for-sale	1,141,367		1,141,367		939,046
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	102,300		102,300
Fair value of derivative instrument	4,400		4,400
Securities on Deposit With State Regulatory Authorities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale	$ 13,800		$ 13,800		$ 9,900

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