Note 6 - Investments - Gains and Losses on Equity Securities (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Investments [Abstract] | ||
| Net gains and losses recognized during the period on equity securities | $ (3,646) | $ 2,165 |
| Less: Net gains and losses realized during the period on equity securities | 0 | (3,938) |
| Unrealized net gains and losses recognized during the period on equity securities still held at the reporting date | $ (3,646) | $ (1,773) |