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Note 17 - Share Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	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)	$ 282.20	$ 335.70	$ 102.32
Proceeds from Stock Options Exercised	$ 13,786	$ 38,787	$ 13,089
Payment, Tax Withholding, Share-Based Payment Arrangement	$ 40,923	$ 58,903	$ 14,910
Board of Directors Chairman [Member]
Deferred Compensation Arrangement with Individual, Shares Issued (in shares)	8,572	4,677	15,275
Deferred Compensation Arrangement with Individual, Shares Granted (in shares)	5,008	3,160	10,528
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 1,886	$ 1,579	$ 1,558
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense	$ 6,911	$ 6,462	$ 5,860
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)	17,376	8,608	24,070
Proceeds from Stock Options Exercised	$ 13,786	$ 38,787	$ 13,089
Payment, Tax Withholding, Share-Based Payment Arrangement	14,089	$ 31,680	$ 7,297
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 16,098
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 9 months 18 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)	92,008	80,583	70,718
Payment, Tax Withholding, Share-Based Payment Arrangement	$ 26,834	$ 27,223	$ 7,613
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 48,934
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 1 month 6 days
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	$ 22,570	$ 17,492	$ 15,022
Minimum [Member]
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 103.50	$ 323.66	$ 91.00
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)	$ 315.88	$ 438.83	$ 158.89
Performance Share Award, Percentage	200.00%
Equity Incentive Plan (Plan) [Member]
Share-Based Payment Arrangement, Expense	$ 2,379	$ 6,249	$ 11,681
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	$ 27,102	$ 17,705	$ 9,201

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