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Note 6 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Nov. 15, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%    
Income Tax Benefit, Cares Act $ 6,900    
Additional Interest Expense Deduction , CARES Act 6,000    
Annual Limitation Of Companys Ownership Change 15,000    
Deferred Tax Assets, Valuation Allowance, Total 140,428 $ 103,496  
Undistributed Earnings of Foreign Subsidiaries 140,800    
Unrecognized Tax Benefits, Income Tax Penalties Accrued 22,100 24,800  
Foreign Tax Credits and Other Tax Attributes 337,900    
Unrecognized Tax Benefits, Period Increase (Decrease), Total 5,900    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 35,300 48,600  
Domestic Tax Authority [Member]      
Taxable Income Limitation With Indefinite Carryover Percentage 80.00%    
Operating Loss Carryforwards, Total $ 320,700 300,000  
Domestic Tax Authority [Member] | IRC Section382 Limitation [Member]      
Operating Loss Carryforwards, Total 159,300 $ 145,900  
Foreign Tax Authority [Member]      
Operating Loss Carryforwards, Total 110,900    
Tax Credit Carryforward, Amount 387,400    
Gulf Mark Offshore Inc [Member]      
Annual Limitation Of Companys Ownership Change $ 7,000    
Other Liabilities [Member] | Gulf Mark Offshore Inc [Member]      
Deferred Income Tax Liabilities, Net, Total     $ 1,000