Note 6 - Income Taxes (Details Textual) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Undistributed Earnings of Foreign Subsidiaries	$ 1.4
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	174.0	$ 169.0	$ 120.0
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	(99.0)
Luxembourg Inland Revenue [Member] \| Maximum [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	3,100.0
National Tax Service of Korea [Member]
Income Taxes Receivable, Noncurrent	$ 261.0	$ 349.0

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

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