Note 2 - Revenue (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Contract with Customer, Liability, Customer Deposits	$ 1,200		$ 1,300
Increase (Decrease) in Contract with Customer, Liability	70	$ 83
HSG [Member]
Contract with Customer, Liability	$ 863		$ 869
Maximum [Member]
Long Term Supply, Commitment Period (Year)	10 years