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Note 7 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Effective Income Tax Rate Reconciliation, Percent 24.00% 25.20% 25.60% 26.80%  
Unrecognized Tax Benefits $ 80,600   $ 80,600    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 64,900   64,900    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 17,300   17,300    
Deferred Income Tax Liabilities, Net $ 938,360   $ 938,360   $ 896,249