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Note 7 - Employee Benefit Plans (Details Textual) $ in Millions	12 Months Ended
	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

X

- Definition

The minimum age under the defined contribution plan.

+ References

No definition available.

+ Details

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X

- Definition

Period of minimum service under the defined contribution plan.

+ References

No definition available.

+ Details

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X

- Definition

Period of payment of defined contribution plan.

+ References

No definition available.

+ Details

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X

- Definition

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+ References

No definition available.

+ Details

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X

- 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

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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

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