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Note 7 - Income Taxes - Changes in Valuation Allowances (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Balance at the beginning of the period $ 862,201 $ 881,286 $ 829,087
Additions 168,732 88,497 146,451
Reductions (158,567) (107,582) (94,252)
Balance at end of period $ 872,365 $ 862,201 $ 881,286