XML 88 R73.htm IDEA: XBRL DOCUMENT v3.20.4
Note 9 - Employee Retirement Plans (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Plan Assets, Contributions by Employer   $ 1,615 $ 5,027 $ 10,546  
Defined Benefit Plan Concentration Risk Assets Equity Securities Difference Plan Assets And Liabilities   25.00%      
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year   $ 0      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   2.50% 3.50%    
Defined Contribution Plan Company Contribution Percentage   3.00%      
Pension Plan [Member]          
Defined Benefit Plan, Plan Assets, Contributions by Employer   $ 0 $ 1,100 0  
Supplemental Employee Retirement Plan [Member]          
Defined Benefit Plan, Plan Assets, Contributions by Employer   $ 1,600 3,200 900  
Supplemental Employee Retirement Plan [Member] | Chief Executive Officer [Member]          
Defined Benefit Plan, Benefit Obligation, Payment for Settlement $ 8,900        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement $ (300)        
Postretirement Health Coverage [Member]          
Gain (Loss) On Termination Of Post Retirement Benefit Plan       $ 4,000  
Retirement Plans Contributions [Member]          
Defined Contribution Plan Company Contribution Vesting Period (Year)   5 years      
Defined Contribution Saving Plan, A401 K [Member]          
Defined Contribution Plan Company Contribution Vesting Period (Year)   5 years      
Defined Contribution Plan, Percent, Contributed By Employee Minimum   2.00%      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent   75.00%      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match   8.00%     50.00%
Common Stock, Shares Held in Employee Trust, Shares (in shares)       7,075  
Multinational Retirement Plan [Member]          
Defined Contribution Plan Company Contribution Vesting Period (Year)   5 years      
Defined Contribution Plan, Percent, Contributed By Employee Minimum   1.00%      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent   50.00%      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match   6.00%     50.00%
Merchant Navy Officers Pension Fund [Member]          
Postemployment Benefits Liability, Total   $ 700 $ 1,000    
Postemployment Benefits, Period Expense   $ 200