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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 |

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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 http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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