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Note 13 - Retirement Benefit Plans - Weighted-average Asset Allocations by Asset Category (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Asset $ 0    
Pension Plan [Member]      
Asset   $ 15,000  
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset   2,800  
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset   0  
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset   12,200  
Pension Plan [Member] | Foreign Plan [Member]      
Asset 13,300 12,200 $ 10,800
Pension Plan [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 0    
Pension Plan [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0    
Pension Plan [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 13,300    
Pension Plan [Member] | Investment Account Held by Pension Plan [Member]      
Asset [1]   12,200  
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset [1]   0  
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset [1]   0  
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset [1]   12,200  
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] | Foreign Plan [Member]      
Asset [1] 13,300    
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset [1] 0    
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset [1] 0    
Pension Plan [Member] | Investment Account Held by Pension Plan [Member] | Foreign Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset [1] $ 13,300    
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member]      
Asset   2,800  
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset   2,800  
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset   0  
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset   $ 0  
[1] This category is comprised of investments in insurance contracts.