Note 5 - Investments - Movement in Available-For-Sale (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Statement Line Items [Line Items] | ||
| Equity securities, beginning of year | $ 11,951 | $ 1,408 |
| Disposition of equity securities at fair value | (6,371) | (3,950) |
| Gains (losses) on remeasuring available-for-sale financial assets, before tax | (4,401) | 14,493 |
| Equity securities | $ 1,179 | $ 11,951 |