Note 3 - Revenue (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Contract with Customer, Liability	$ 1,200		$ 1,200		$ 1,200
Increase (Decrease) in Contract with Customer, Liability	36	$ 6	127	$ 88
HSG [Member]
Contract with Customer, Liability	$ 883		$ 883		$ 860
Maximum [Member]
Long Term Supply, Commitment Period (Year)			10 years