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Note 19 - Post-retirement Benefits (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2015
Deferred Compensation Liability, Current and Noncurrent, Total	$ 9,339	$ 0
Cash Surrender Value of Life Insurance	$ 18,857	$ 0
Executive Officer [Member]
Deferred Compensation Arrangement with Individual, Requisite Service Period (Year)	5 years
Deferred Compensation Liability, Current and Noncurrent, Total	$ 9,300
Cash Surrender Value of Life Insurance	$ 18,900
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	58.00%
UNITED KINGDOM \| Pension Plan [Member] \| Stabilizing Portfolio [Member]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	42.00%
Group Personal Pension Plan [Member] \| UNITED KINGDOM \| Minimum [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.50%	4.00%
Group Personal Pension Plan [Member] \| UNITED KINGDOM \| Maximum [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%	6.00%
The 401K and GPP [Member]
Defined Contribution Plan, Cost	$ 7,300	$ 6,400	$ 8,700