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Note 17 - Share Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jun. 13, 2019	Feb. 10, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)					9,100,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 119.31	$ 282.2	$ 335.7
Proceeds from Stock Options Exercised	$ 7,815	$ 13,786	$ 38,787
Payment, Tax Withholding, Share-Based Payment Arrangement	$ 10,897	$ 40,923	$ 58,903
Board of Directors Chairman [Member]
Deferred Compensation Arrangement with Individual, Shares Issued (in shares)	16,174	8,572	4,677
Deferred Compensation Arrangement with Individual, Shares Granted (in shares)	8,832	5,008	3,160
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 1,846	$ 1,886	$ 1,579
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense	$ 8,229	$ 6,911	$ 6,462
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)			10 years
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)	31,030	17,376	8,608
Proceeds from Stock Options Exercised	$ 7,815	$ 13,786	$ 38,787
Payment, Tax Withholding, Share-Based Payment Arrangement	4,895	$ 14,089	$ 31,680
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 18,109
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 7 months 6 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)	50,577	92,008	80,583
Payment, Tax Withholding, Share-Based Payment Arrangement	$ 6,002	$ 26,834	$ 27,223
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 53,392
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Performance Measurement, Period (Year)	3 years
Restricted Stock and Performance Shares [Member]
Share-Based Payment Arrangement, Expense	$ 27,263	$ 22,570	$ 17,492
Minimum [Member]
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 110.86	$ 103.5	$ 323.66
Performance Share Award, Percentage	0.00%
Maximum [Member]
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 119.57	$ 315.88	$ 438.83
Performance Share Award, Percentage	200.00%
Equity Incentive Plan (Plan) [Member]
Share-Based Payment Arrangement, Expense	$ 309	$ 2,379	$ 6,249
The 2019 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)				2,700,000
Share-Based Payment Arrangement, Expense	$ 35,183	$ 27,102	$ 17,705

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