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Note 7 - Income Taxes (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 25.80% 25.80% 25.80%
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense $ 12.7 $ 11.6  
Other Noncurrent Liabilities [Member]      
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 74.5 $ 59.5  
Domestic Tax Jurisdiction [Member] | Dutch Tax and Customs Administration [Member]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 25.80% 25.80%  
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member]      
Operating Loss Carryforwards $ 608.6    
Operating Loss Carryforwards Subject to Expiration 144.7    
Operating Loss Carryforwards, Not Subject to Expiration $ 463.9