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Note 6 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
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 | $ 441,893 | 204,899
Undistributed Earnings of Foreign Subsidiaries | 71,100 |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 15,800 | 17,800
Foreign Tax Credits and Other Tax Attributes | 157,700 |
Unrecognized Tax Benefits, Period Increase (Decrease), Total | 11,900 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 22,500 | 29,300
Gulf Mark Offshore Inc [Member] |  |
Annual Limitation Of Companys Ownership Change |  | 7,000
Domestic Tax Authority [Member] |  |
Operating Loss Carryforwards | 445,600 | 417,900
Domestic Tax Authority [Member] | IRC Section382 Limitation [Member] |  |
Operating Loss Carryforwards | 166,200 | $ 163,700
Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards | 415,700 |
Tax Credit Carryforward, Amount | 405,300 |
Non U.S Foreign Country [Member] |  |
Tax Credit Carryforward, Amount | $ 7,700 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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