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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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