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Note 19 - Post-retirement Benefits - Asset Categorization (Details) - Pension Plan [Member] - UNITED KINGDOM - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair value of asset $ 137,725 $ 123,840 $ 212,688
Fair Value, Inputs, Level 1 [Member]      
Fair value of asset 137,111 123,062  
Fair Value, Inputs, Level 2 [Member]      
Fair value of asset 277 395  
Fair Value, Inputs, Level 3 [Member]      
Fair value of asset 337 383 $ 360
DGF [Member]      
Fair value of asset 64,023 55,633  
DGF [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of asset 64,023 55,633  
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 47,283 45,170  
LDI [MEmber] | Fair Value, Inputs, Level 1 [Member]      
Fair value of asset 47,283 45,170  
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 24,835 21,899  
Bond Funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of asset 24,835 21,899  
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 185 188  
Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of asset 185 188  
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 1,399 950  
Defined Benefit Plan, Other Assets [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of asset 785 172  
Defined Benefit Plan, Other Assets [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of asset 277 395  
Defined Benefit Plan, Other Assets [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair value of asset $ 337 $ 383