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Note 6 - Income Taxes - Summary of Income Tax Contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Balance $ 177,382 [1] $ 333,653 [1] $ 351,047
Additions based on tax positions related to a prior year 1,869 10,155 53
Settlement and lapse of statute of limitations     18,515
Reductions based on tax positions related to a prior year (712)   (35,962)
Additions based on tax positions related to the current year 212 744  
Settlement and lapse of statute of limitations (165,065) (167,170)  
Balance $ 13,686 $ 177,382 [1] $ 333,653 [1]
[1] The gross balance reported as uncertain tax positions is largely offset by $157.7 million of foreign tax credits and other tax attributes.