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Note 19 - Post-retirement Benefits (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2015
Deferred Compensation Liability, Current and Noncurrent, Total $ 0 $ 9,339    
Cash Surrender Value of Life Insurance $ 0 $ 18,857    
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 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%      
The 401K and GPP [Member]        
Defined Contribution Plan, Cost $ 8,400 $ 7,300 $ 6,400