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Note 19 - Post-retirement Benefits (Details Textual) $ in Millions | 12 Months Ended |
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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% |  |  |

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- 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 + Details
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- 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 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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