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Note 7 - Employee Benefit Plans (Details Textual) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Defined Contribution Plan, Cost | $ 35.2 | $ 34.3 | $ 32.5
Defined Contribution Plan, Minimum Age | 55 |  |
Defined Contribution Plan, Minimum Service Period | 15 years |  |
Deferred Compensation Liability, Current and Noncurrent | $ 33.9 | 31.6 |
Other Current Assets [Member] | Defined Benefit Plan, Equity Securities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount | $ 33.9 | $ 31.6 |
Minimum [Member] |  |  |
Defined Contribution Plan, Payment Period | 2 years |  |
Maximum [Member] |  |  |
Defined Contribution Plan, Payment Period | 25 years |  |

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- Definition Period of minimum service under the defined contribution plan. + References No definition available. + Details
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- Definition Period of payment of defined contribution plan. + References No definition available. + Details
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- Definition Amount of investment within defined benefit plan asset category. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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