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Note 19 - Post-retirement Benefits - Actual Return on Plan Assets (Details) - Pension Plan [Member] - UNITED KINGDOM - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Expected return on plan assets $ 6,977 $ 6,796 $ 5,499
Actuarial (loss) gain on assets 2,319 (74,332) 11,378
Actual return on plan assets $ 9,296 $ (67,536) $ 16,877