Note 19 - Post-retirement Benefits - Actuarial Gain (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Actuarial gain (loss) on defined benefit plans	$ (4,529)	$ 7,440	$ 22,345
Pension Plan [Member] \| UNITED KINGDOM
Actuarial (loss) gain on assets	2,319	(74,332)	11,378
Actuarial gain (loss) on liabilities	(6,848)	81,772	10,967
Actuarial gain (loss) on defined benefit plans	$ (4,529)	$ 7,440	$ 22,345

Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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