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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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