Note 7 - Marketable Securities - Net Gain (Loss) of Investment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Loss on marketable securities, net	$ (27,686)	$ (10,144)
Loss on marketable securities, net	(27,686)	(10,144)
Less: Net loss recognized related to marketable securities sold	27,695	10,418
Unrealized gain related to marketable securities still held	9	274
Other Income, Net and Special Dividend Income [Member]
Dividend income (included in Other income, net and Special dividend income)	$ 1,705	$ 197,575