Note 4 - Marketable Securities - Summary of Gros Realized Gains and Losses from Sale of Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Gross realized gains from sale of available-for-sale marketable securities | $ 0 | $ 16 | $ 0 | $ 16 |
| Gross realized losses from sale of available-for-sale marketable securities | $ 0 | $ 0 | $ 0 | $ 0 |