Note 8 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Restricted Cash	$ 128
U S International Development Finance Corporation [Member]
Line of Credit Facility, Maximum Borrowing Capacity	765
BRAZIL
Restricted Cash and Investments, Noncurrent	6	$ 6
Federal And State Value Added Taxes Litigations And Civil Litigation And Disputes With Former Employees [Member] | BRAZIL
Loss Contingency, Accrual, Reserve Maintained	2
Aggregate Claims	122
Loss Contingency, Estimate of Possible Loss	6
Threat of Expropriation of Assets [Member] | BRAZIL
Restricted Cash and Investments, Noncurrent	6
Assets, Noncurrent	43
Bank Guarantees And Letters Of Credit [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted	1
Surety Bond [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted	9
L C Facility Agreement [Member]
Letters of Credit Outstanding, Amount	$ 31