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Note 2 - Investments (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	528		483
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 478,650		$ 450,989
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	36,606		34,303
Proceeds from Sale of Debt Securities, Available-for-Sale	2,200	$ 5,100
Debt Securities, Available-for-Sale	662,992		643,799
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	22,900
Securities on Deposit With State Regulatory Authorities [Member]
Debt Securities, Available-for-Sale	$ 7,400		$ 8,600

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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