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Note 6 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Accrued Income Taxes, Current $ 64,725 $ 48,122
Deferred Tax Assets, Net 524,000 533,500
Deferred Tax Assets, Valuation Allowance 511,900 $ 533,000
US Deferred Income Tax Expense (Benefit) (16,200)  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 27,000  
SPO [Member]    
Deferred Tax Assets, Net 51,200  
Deferred Tax Assets, Valuation Allowance 51,200  
Pillar Two Adjustments [Member]    
Accrued Income Taxes, Current $ 11,000