Note 7 - Employee Benefit Plans (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Defined Contribution Plan, Cost	$ 35.8	$ 35.2	$ 34.3
Defined Contribution Plan, Minimum Age	55
Defined Contribution Plan, Minimum Service Period	15 years
Deferred Compensation Liability, Current and Noncurrent	$ 36.3	33.9
Other Current Assets [Member] | Defined Benefit Plan, Equity Securities [Member]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	$ 36.3	$ 33.9
Minimum [Member]
Defined Contribution Plan, Payment Period	2 years
Maximum [Member]
Defined Contribution Plan, Payment Period	25 years