Note 6 - Fair Value Measurements (Details Textual) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Long-Term Debt, Total	$ 1,243.8	$ 945.2
Fair Value, Nonrecurring [Member] \| Senior Notes [Member]
Long-Term Debt, Total	1,240.0	945.2
Long-Term Debt, Fair Value	$ 905.0	$ 1,040.0

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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