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Note 19 - Post-retirement Benefits - Analysis of Plan Assets and Expected Rate of Return (Details) - UNITED KINGDOM - Pension Plan [Member] - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair value of asset $ 212,688 $ 203,630 $ 194,554
DGF [Member]      
Expected rate of return 4.60% 4.20%  
Fair value of asset $ 123,460 $ 116,590  
LDI [MEmber]      
Expected rate of return 1.10% 0.70%  
Fair value of asset $ 61,163 $ 67,395  
Bond Funds [Member]      
Expected rate of return 1.80% 1.40%  
Fair value of asset $ 26,571 $ 17,382  
Defined Benefit Plan, Equity Securities [Member]      
Expected rate of return 1.50% 2.30%  
Fair value of asset $ 360 $ 233  
Defined Benefit Plan, Other Assets [Member]      
Expected rate of return 1.50% 1.80%  
Fair value of asset $ 1,134 $ 2,030