v3.25.4

Note 6 - Income Taxes (Details Textual) - USD ($) $ in Millions				12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%	21.00%	21.00%
Income Taxes Receivable	$ 34.9	$ 116.7		$ 34.9	$ 116.7
Unrecognized Tax Benefits	67.7	78.0	$ 80.9	67.7	78.0	$ 80.9	$ 89.1
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	54.8	63.4		54.8	63.4
Income Tax Examination, Penalties and Interest Accrued, Total	7.2	7.8	$ 5.3
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 13.6	$ 13.1		$ 13.6	$ 13.1
Domestic Tax Jurisdiction [Member]
Open Tax Year				2020 2021 2022 2023 2024 2025
State and Local Jurisdiction [Member]
Open Tax Year				2018 2019 2020 2021 2022 2023 2024 2025

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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Tax year that remains open to examination under enacted tax laws, in YYYY format.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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