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Note 6 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | 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 | 532,994 | $ 591,720 |
Undistributed Earnings of Foreign Subsidiaries | 220,300 |  |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 9,400 | 13,600 |
Foreign Tax Credits and Other Tax Attributes |  |  | $ 157,700
Unrecognized Tax Benefits, Period Increase (Decrease) | 5,800 |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 21,000 | 20,900 |
Gulf Mark Offshore Inc [Member] |  |  |
Annual Limitation Of Companys Ownership Change | 5,600 |  |
Domestic Tax Jurisdiction [Member] |  |  |
Operating Loss Carryforwards | 216,500 | 320,800 |
Domestic Tax Jurisdiction [Member] | Foreign Tax Credit [Member] |  |  |
Tax Credit Carryforward, Amount | 406,400 |  |
Domestic Tax Jurisdiction [Member] | Expiring in 2035 [Member] |  |  |
Operating Loss Carryforwards | 33,700 |  |
Domestic Tax Jurisdiction [Member] | Indefinite Carryforwards [Member] |  |  |
Operating Loss Carryforwards | 182,800 |  |
Domestic Tax Jurisdiction [Member] | IRC Section382 Limitation [Member] |  |  |
Operating Loss Carryforwards | 70,100 | $ 131,000 |
Foreign Tax Jurisdiction [Member] |  |  |
Operating Loss Carryforwards | 377,000 |  |
Tax Credit Carryforward, Amount | $ 7,400 |  |

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