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Note 6 - Income Taxes - Summary of Income Tax Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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