Note 5 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Deferred Tax Assets, Valuation Allowance	$ 332,006	$ 532,994
Non-cash Deferred Tax Benefits	201,500
Undistributed Earnings of Foreign Subsidiaries	320,800
Unrecognized Tax Benefits, Income Tax Penalties Accrued	10,500	9,400
Foreign Tax Credits and Other Tax Attributes			$ 157,700
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	21,600	21,000
Gulf Mark Offshore Inc [Member]
Annual Limitation Of Companys Ownership Change	5,600
Domestic Tax Jurisdiction [Member]
Operating Loss Carryforwards	72,700	216,500
Operating Loss Carryfowards, Not Subject to Expiration	44,500
Domestic Tax Jurisdiction [Member] | Expiring in 2035 [Member]
Operating Loss Carryforwards	28,200
Domestic Tax Jurisdiction [Member] | IRC Section382 Limitation [Member]
Operating Loss Carryforwards		$ 70,100
Foreign Tax Jurisdiction [Member]
Operating Loss Carryforwards	389,300
Tax Credit Carryforward, Amount	$ 232,700