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Note 19 - Post-retirement Benefits - Net Periodic Benefit Cost (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)
Plan curtailment / amendment credit recognized 0 5,510 0
Amortization of prior service credit (249) 0 0
Pension Plan [Member] | UNITED KINGDOM      
Current service cost (439) (539) (1,218)
Interest cost (3,407) (4,551) (6,083)
Expected return on plan assets 5,499 6,064 6,425
Plan curtailment / amendment events recognized in consolidated statements of operations 0 2,269 47
Amortization of prior service credit 249 0 0
Reclassified net remeasurement (loss) gains 244 (104) 0
Amounts included in consolidated statements of operations 2,146 3,139 (829)
Actuarial gain (loss) on defined benefit plans 22,345 (9,356) (3,521)
Plan curtailment / amendment credit recognized 0 5,510 0
Amortization of prior service credit (249) 0 0
Reclassified net remeasurement (loss) gains (244) 104 0
Other comprehensive income (loss) 21,852 (3,742) (3,521)
Total comprehensive income (loss) $ 23,998 $ (603) $ (4,350)