Note 5 - Investments (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Statement Line Items [Line Items] | ||
| Proceeds from disposition of equity securities | $ 6,371 | $ 3,950 |
| Transfer of gain on disposal of equity securities at FVOCI to deficit, net of tax | 0 | 0 |
| Tax on transfer of gain on disposal of equity securities at FVOCI to deficit | 784 | 177 |
| Gains (losses) on remeasuring available-for-sale financial assets, before tax | (4,401) | 14,493 |
| Deferred tax liabilities, unrealized gain | 597 | 1,713 |
| Retained earnings [member] | ||
| Statement Line Items [Line Items] | ||
| Transfer of gain on disposal of equity securities at FVOCI to deficit, net of tax | 5,026 | 1,137 |
| Gains (losses) on remeasuring available-for-sale financial assets, before tax | $ 0 | $ 0 |