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Note 4 - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2022 | May 31, 2022 | Sep. 30, 2021 | Jan. 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Pension Plan [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 4.2 | $ 5.6 | $ 5.4 | $ 16.8 |  |  |  |
Nonoperating Income (Expense) [Member] |  |  |  |  |  |  |  |
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component |  |  |  |  | $ 1.4 | $ 0.2 | $ 4.1 | $ 0.5

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