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Note 6 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Nov. 15, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |
Income Tax Benefit, Cares Act | $ 6,900 |  |
Additional Interest Expense Deduction , CARES Act | 6,000 |  |
Annual Limitation Of Companys Ownership Change | 15,000 |  |
Deferred Tax Assets, Valuation Allowance, Total | 140,428 | $ 103,496 |
Undistributed Earnings of Foreign Subsidiaries | 140,800 |  |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 22,100 | 24,800 |
Foreign Tax Credits and Other Tax Attributes | 337,900 |  |
Unrecognized Tax Benefits, Period Increase (Decrease), Total | 5,900 |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 35,300 | 48,600 |
Domestic Tax Authority [Member] |  |  |
Taxable Income Limitation With Indefinite Carryover Percentage | 80.00% |  |
Operating Loss Carryforwards, Total | $ 320,700 | 300,000 |
Domestic Tax Authority [Member] | IRC Section382 Limitation [Member] |  |  |
Operating Loss Carryforwards, Total | 159,300 | $ 145,900 |
Foreign Tax Authority [Member] |  |  |
Operating Loss Carryforwards, Total | 110,900 |  |
Tax Credit Carryforward, Amount | 387,400 |  |
Gulf Mark Offshore Inc [Member] |  |  |
Annual Limitation Of Companys Ownership Change | $ 7,000 |  |
Other Liabilities [Member] | Gulf Mark Offshore Inc [Member] |  |  |
Deferred Income Tax Liabilities, Net, Total |  |  | $ 1,000

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