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Note 8 - Marketable Securities - Net Gain (Loss) of Investment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Gain/(loss) on marketable securities, net | $ 21,262 | $ (315,508) | $ 505,163
Dividend income (included in Other income, net and Special dividend income) | 202,749 | 18,002 | 16,958
Gain/(loss) on marketable securities, net | 21,262 | (315,508) | 505,163
Less: Net gain/(loss) recognized related to marketable securities sold | 10,614 | (15,120) | 0
Unrealized gain/(loss) related to marketable securities still held | $ 31,876 | $ (330,628) | $ 505,163

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