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Note 7 - Income Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	25.00%	19.00%	19.00%
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	$ 4.2	$ 1.7
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 30.1
Open Tax Year	2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
Other Noncurrent Liabilities [Member]
Liability for Uncertainty in Income Taxes, Noncurrent	$ 46.0	$ 35.4
Domestic Tax Authority [Member] | Dutch Tax and Customs Administration [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	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%
Operating Loss Carryforwards, Total	$ 1,840.3
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total	664.0
Operating Loss Carryforwards Subject to Expiration	567.0
Domestic Tax Authority [Member] | Norwegian Tax Administration [Member]
Operating Loss Carryforwards, Total	$ 127.7

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
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Amount recognized for uncertainty in income taxes classified as noncurrent.

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Tax year that remains open to examination under enacted tax laws, in YYYY format.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Amount of operating loss carryforwards that are subject to expiration.

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