Note 10 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Schedule Of Income Taxes [Line Items]
U.S. corporate income tax rate	21.00%	21.00%
Foreign Tax Authority [Member]
Schedule Of Income Taxes [Line Items]
Unrecognized tax benefits, settlements paid	$ 2
Decrease in net deferred tax assets	$ 2
Liability for Uncertain Tax Positions, Current		$ 3
Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued		$ 4