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Note 17 - Share Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	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)	$ 335.70	$ 102.32	$ 52.07
Proceeds from Stock Options Exercised	$ 38,787	$ 13,089	$ 9,395
Payment, Tax Withholding, Share-based Payment Arrangement	$ 58,903	$ 14,910	$ 6,438
Board of Directors Chairman [Member]
Deferred Compensation Arrangement with Individual, Shares Issued (in shares)	4,677	15,275	22,544
Deferred Compensation Arrangement with Individual, Shares Granted (in shares)	3,160	10,528	16,604
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 1,579	$ 1,558	$ 1,391
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense	$ 6,462	$ 5,860	$ 5,597
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)	8,608	24,070	32,211
Proceeds from Stock Options Exercised	$ 38,787	$ 13,089	$ 9,395
Payment, Tax Withholding, Share-based Payment Arrangement	31,680	$ 7,297	$ 3,360
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 12,829
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)	80,583	70,718	55,953
Payment, Tax Withholding, Share-based Payment Arrangement	$ 27,223	$ 7,613	$ 3,078
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 35,104
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 2 months 12 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	$ 17,492	$ 15,022	$ 11,097
Minimum [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 323.66	$ 91.00	$ 52.07
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)	$ 438.83	$ 158.89
Performance Share Award, Percentage	200.00%
Equity Incentive Plan (Plan) [Member]
Share-based Payment Arrangement, Expense	$ 6,249	$ 11,681	$ 15,738
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	$ 17,705	$ 9,201	$ 956

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