Note 9 - Marketable Securities - Net Gain (Loss) and Dividend Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
(Loss)/gain on marketable securities, net	$ (315,508)	$ 505,163	$ 594,753
Dividend income (included in Other income, net)	$ 18,002	$ 16,958	$ 4,096