Note 2 - Revenue (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Contract with Customer, Liability	$ 1,100		$ 1,200
Increase (Decrease) in Contract with Customer, Liability	80	$ 70
HSG [Member]
Contract with Customer, Liability	$ 826		$ 860
Maximum [Member]
Long Term Supply, Commitment Period (Year)	10 years