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Note 5 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
May 27, 2020
Dec. 31, 2021
Dec. 31, 2020
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00%  
Income Tax Benefit, Cares Act     $ 6,900
Annual Limitation Of Companys Ownership Change   $ 15,000  
Deferred Tax Assets, Valuation Allowance, Total   204,899 140,428
Undistributed Earnings of Foreign Subsidiaries   36,400  
Unrecognized Tax Benefits, Income Tax Penalties Accrued   17,800 22,100
Foreign Tax Credits and Other Tax Attributes   322,100  
Unrecognized Tax Benefits, Period Increase (Decrease), Total   6,400  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate   29,300 35,300
Gulf Mark Offshore Inc [Member]      
Annual Limitation Of Companys Ownership Change   7,000  
Domestic Tax Authority [Member]      
Taxable Income Limitation With Indefinite Carryover Percentage 80.00%    
Operating Loss Carryforwards, Total   417,900 320,700
Domestic Tax Authority [Member] | IRC Section382 Limitation [Member]      
Operating Loss Carryforwards, Total   163,700 $ 159,300
Foreign Tax Authority [Member]      
Operating Loss Carryforwards, Total   160,000  
Tax Credit Carryforward, Amount   $ 405,300