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Note 16 - Retirement Benefit Plans - Assumptions Used in Determining Benefit Obligation (Details) - Pension Plan [Member]
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Discount rate 5.50% 4.50%
Inflation — Retail Price Index (“RPI”) 3.20% 3.10%
Inflation — Consumer Price Index (“CPI”) 2.50% 2.50%
Pension increases (RPI capped at 5% per annum (“p.a.”)) 3.10% 3.00%
Pension increases (RPI capped at 2.5% p.a.) 2.10% 2.10%
Life expectancy of male aged 60 at accounting date (Year) 29 years 29 years 1 month 6 days
Life expectancy of male aged 60 in 15 years’ time (Year) 30 years 30 years 1 month 6 days