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Note 6 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%  
Annual Limitation Of Companys Ownership Change $ 15,000  
Deferred Tax Assets, Valuation Allowance 591,720 $ 441,893
Undistributed Earnings of Foreign Subsidiaries 153,700  
Unrecognized Tax Benefits, Income Tax Penalties Accrued 13,600 15,800
Foreign Tax Credits and Other Tax Attributes 157,700  
Unrecognized Tax Benefits, Period Increase (Decrease) 9,000  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 20,900 22,500
Gulf Mark Offshore Inc [Member]    
Annual Limitation Of Companys Ownership Change 5,600  
Domestic Tax Authority [Member]    
Operating Loss Carryforwards 320,800 445,600
Domestic Tax Authority [Member] | Foreign Tax Credit [Member]    
Tax Credit Carryforward, Amount 405,300  
Domestic Tax Authority [Member] | Expiring in 2035 [Member]    
Operating Loss Carryforwards 39,300  
Domestic Tax Authority [Member] | Indefinite Carryforwards [Member]    
Operating Loss Carryforwards 281,500  
Domestic Tax Authority [Member] | IRC Section382 Limitation [Member]    
Operating Loss Carryforwards 131,000 $ 166,200
Foreign Tax Authority [Member]    
Operating Loss Carryforwards 471,500  
Tax Credit Carryforward, Amount $ 7,800