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Note 19 - Post-retirement Benefits - Actuarial Gain (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Actuarial gain (loss) on defined benefit plans $ 22,345 $ (9,356) $ (3,521)
Pension Plan [Member] | UNITED KINGDOM      
Actuarial gain on assets 11,378 16,678 18,801
Actuarial gain (loss) on liabilities 10,967 (26,034) (22,322)
Actuarial gain (loss) on defined benefit plans $ 22,345 $ (9,356) $ (3,521)