Note 7 - Income Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	25.80%	25.00%	19.00%
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	$ 9.8	$ 4.2
Unrecognized Tax Benefits That Would Not Impact Effective Tax Rate	$ 30.1	30.1
Open Tax Year	2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Other Noncurrent Liabilities [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 58.0	$ 46.0
Domestic Tax Authority [Member] \| Dutch Tax and Customs Administration [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	25.80%	25.00%
Domestic Tax Authority [Member] \| Her Majesty's Revenue and Customs (HMRC) [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			19.00%
Domestic Tax Authority [Member] \| Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	$ 628.7
Operating Loss Carryforwards Subject to Expiration	160.6
Operating Loss Carryforwards, Not Subject to Expiration	$ 468.1

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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