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Note 17 - Share Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 13, 2024 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | 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) |  | $ 135.79 | $ 112.66 | $ 119.31 |  |
Proceeds from Stock Options Exercised |  | $ 4,860 | $ 27,558 | $ 7,815 |  |
Payment, Tax Withholding, Share-Based Payment Arrangement |  | $ 14,284 | $ 24,769 | $ 10,897 |  |
Board of Directors Chairman [Member] |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Shares Issued (in shares) |  | 14,489 | 14,814 | 16,174 |  |
Deferred Compensation Arrangement with Individual, Shares Granted (in shares) |  | 9,224 | 8,484 | 8,832 |  |
Deferred Compensation Arrangement with Individual, Compensation Expense |  | $ 1,749 | $ 1,992 | $ 1,846 |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  | $ 6,910 | $ 8,122 | $ 8,229 |  |
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) |  | 0 | 9,701 | 31,030 |  |
Proceeds from Stock Options Exercised |  | $ 4,860 | $ 27,558 | $ 7,815 |  |
Payment, Tax Withholding, Share-Based Payment Arrangement |  | 1,154 | $ 13,672 | $ 4,895 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 9,334 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 2 years 2 months 12 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) |  | 91,087 | 78,465 | 50,577 |  |
Payment, Tax Withholding, Share-Based Payment Arrangement |  | $ 13,130 | $ 11,097 | $ 6,002 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 60,662 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 1 year 10 months 24 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 |  | $ 43,037 | $ 41,126 | $ 27,263 |  |
Minimum [Member] |  |  |  |  |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  | $ 112.45 | $ 110.86 |  |
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) |  |  | $ 147.41 | $ 119.57 |  |
Performance Share Award, Percentage |  |  | 200.00% |  |  |
Equity Incentive Plan (Plan) [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  | 0 | $ 0 | $ 309 |  |
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 |  | $ 49,947 | $ 49,248 | $ 35,183 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) | 3,900,000 |  |  |  |  |

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