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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 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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