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Note 19 - Post-retirement Benefits - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Actuarial gain (loss) on defined benefit plans $ 7,440 $ 22,345 $ (9,356)
Plan curtailment / amendment credit recognized 0 0 5,510
Amortization of prior service credit (249) (249) 0
Pension Plan [Member] | UNITED KINGDOM      
Current service cost (357) (439) (539)
Interest cost (4,307) (3,407) (4,551)
Expected return on plan assets 6,796 5,499 6,064
Plan curtailment / amendment events recognized in consolidated statements of operations 0 0 2,269
Amortization of prior service credit 249 249 0
Reclassified net remeasurement (loss) gains 0 244 (104)
Amounts included in consolidated statements of operations 2,381 2,146 3,139
Actuarial gain (loss) on defined benefit plans 7,440 22,345 (9,356)
Plan curtailment / amendment credit recognized 0 0 5,510
Amortization of prior service credit (249) (249) 0
Reclassified net remeasurement (loss) gains 0 (244) 104
Other comprehensive income (loss) 7,191 21,852 (3,742)
Total comprehensive income (loss) $ 9,572 $ 23,998 $ (603)