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Note 7 - Income Taxes - Changes in Valuation Allowances (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Balance at the beginning of the period $ 872,365 $ 862,201 $ 881,286
Additions 80,862 168,732 88,497
Reductions (94,225) (158,567) (107,582)
Balance at end of period $ 859,002 $ 872,365 $ 862,201