Note 6 - Other Income (Details Textual) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Profit (Loss) from Real Estate Operations	[1]	$ 70	$ 90	$ 192	$ 335
Real Estate Transaction [Member]
Profit (Loss) from Real Estate Operations					$ 107

[1] The nine months ended September 30, 2023, includes a one-time $107 million transaction.