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Note 6 - Investments (Details Textual) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($)
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 |  | $ 0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 155 |  | 191
Limited Liability Investments [Member] |  |  |
Equity Method Investments | $ 700 |  | $ 700
Equity Method Investment, Other-than-Temporary Impairment | 0 | $ 0 |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 |  |
Argo Holdings [Member] |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 2,900 |  | 2,900
Private Company Investments [Member] |  |  |
Investment Owned, Fair Value | $ 600 |  | $ 700

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