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Note 19 - Post-retirement Benefits (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2015
Defined Contribution Plan, Cost	$ 12.7	$ 8.4	$ 7.3
UNITED KINGDOM | Pension Plan [Member]
Defined Benefit Plan, Number of Employees				80
UNITED KINGDOM | Pension Plan [Member] | Growth Portfolio [Member]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	45.00%
UNITED KINGDOM | Pension Plan [Member] | Stabilizing Portfolio [Member]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	55.00%
The 401k Plan [Member] | UNITED STATES | Maximum [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Group Personal Pension Plan [Member] | UNITED KINGDOM | Maximum [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Group Personal Pension Plan [Member] | UNITED KINGDOM | Minimum [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.50%

X

- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480794/715-70-50-1

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- Definition

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+ References

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- Definition

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+ References

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