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Note 19 - Post-retirement Benefits - Movements in Fair Value of Plan Assets (Details) - Pension Plan [Member] - UNITED KINGDOM - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Opening balance $ 203,630 $ 194,554  
Actual return on plan assets 16,877 22,742 $ 25,226
Exchange differences (2,245) 6,393  
Contributions from the sponsoring companies 4,695 4,005  
Settlements 0 (14,524)  
Benefits paid (10,269) (9,505)  
Payroll tax of employer contributions 0 (35)  
Ending balance $ 212,688 $ 203,630 $ 194,554