Note 6 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Jul. 28, 2020
Restricted Cash	$ 118
U S International Development Finance Corporation [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 765
BRAZIL
Restricted Cash and Investments, Noncurrent	7	$ 8
Federal And State Value Added Taxes Litigations And Civil Litigation And Disputes With Former Employees [Member] | BRAZIL
Loss Contingency, Accrual, Reserve Maintained	4
Aggregate Claims	93
Loss Contingency, Estimate of Possible Loss	5
Threat of Expropriation of Assets [Member] | BRAZIL
Restricted Cash and Investments, Noncurrent	7
Assets, Noncurrent	43
Bank Guarantees And Letters Of Credit [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted	1
Surety Bond [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted	27
L C Facility Agreement [Member]
Letters of Credit Outstanding, Amount	$ 27