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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