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Note 2 - Investments (Details Textual) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 578 |  | 543
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 549,413 |  | $ 484,679
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ 55,259 |  | 46,923
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Number of Securities | 2 |  |
Proceeds from Sale of Debt Securities, Available-for-Sale | $ 9,800 | $ 5,800 |
Debt Securities, Available-for-Sale | 591,907 |  | 515,064
Securities on Deposit With State Regulatory Authorities [Member] |  |  |
Debt Securities, Available-for-Sale | $ 8,600 |  | $ 8,500

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