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Note 19 - Post-retirement Benefits - Asset Categorization (Details) - Pension Plan [Member] - UNITED KINGDOM - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair value of asset $ 123,840 $ 212,688 $ 203,630
Fair Value, Inputs, Level 1 [Member]      
Fair value of asset 123,062 211,999  
Fair Value, Inputs, Level 2 [Member]      
Fair value of asset 395 329  
Fair Value, Inputs, Level 3 [Member]      
Fair value of asset 383 360 $ 292
DGF [Member]      
Fair value of asset 55,633 123,460  
DGF [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of asset 55,633 123,460  
DGF [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of asset 0 0  
DGF [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair value of asset 0 0  
LDI [MEmber]      
Fair value of asset 45,170 61,163  
LDI [MEmber] | Fair Value, Inputs, Level 1 [Member]      
Fair value of asset 45,170 61,163  
LDI [MEmber] | Fair Value, Inputs, Level 2 [Member]      
Fair value of asset 0 0  
LDI [MEmber] | Fair Value, Inputs, Level 3 [Member]      
Fair value of asset 0 0  
Bond Funds [Member]      
Fair value of asset 21,899 26,571  
Bond Funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of asset 21,899 26,571  
Bond Funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of asset 0 0  
Bond Funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair value of asset 0 0  
Defined Benefit Plan, Equity Securities [Member]      
Fair value of asset 188 360  
Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of asset 188 360  
Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of asset 0 0  
Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair value of asset 0 0  
Defined Benefit Plan, Other Assets [Member]      
Fair value of asset 950 1,134  
Defined Benefit Plan, Other Assets [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of asset 172 445  
Defined Benefit Plan, Other Assets [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of asset 395 329  
Defined Benefit Plan, Other Assets [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair value of asset $ 383 $ 360