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Note 17 - Share Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 13, 2019 | Feb. 10, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  | 9,100,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 52.07 | $ 43.88 | $ 40.13 |  |
Proceeds from Stock Options Exercised | $ 9,395 | $ 5,614 | $ 6,951 |  |
Payment, Tax Withholding, Share-based Payment Arrangement | $ 6,438 | $ 5,659 | $ 5,892 |  |
Board of Directors Chairman [Member] |  |  |  |  |
Deferred Compensation Arrangement with Individual, Shares Issued | 22,544 | 33,419 | 34,095 |  |
Deferred Compensation Arrangement with Individual, Shares Vested | 22,544 | 33,419 | 22,762 |  |
Deferred Compensation Arrangement with Individual, Shares Granted | 16,604 | 22,675 | 11,333 |  |
Deferred Compensation Arrangement with Individual, Compensation Expense | $ 1,391 | $ 1,718 | $ 1,133 |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 5,597 | $ 4,998 | $ 4,503 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | 32,211 | 63,817 | 9,033 |  |
Proceeds from Stock Options Exercised | $ 9,395 | $ 5,614 | $ 6,951 |  |
Payment, Tax Withholding, Share-based Payment Arrangement | 3,360 | $ 3,846 | $ 4,301 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 10,649 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 2 years 6 months |  |  |  |
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | 55,953 | 38,186 | 39,500 |  |
Payment, Tax Withholding, Share-based Payment Arrangement | $ 3,078 | $ 1,812 | $ 1,591 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 16,165 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 1 year 10 months 24 days |  |  |  |
Performance Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Performance Measurement, Period | 3 years |  |  |  |
Restricted Stock and Performance Shares [Member] |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 11,097 | $ 9,565 | $ 5,702 |  |
Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 52.07 | $ 43.88 | $ 40.12 |  |
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 |  | $ 45.29 | $ 48.98 |  |
Performance Share Award, Percentage | 200.00% |  |  |  |
Equity Incentive Plan (Plan) [Member] |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 15,738 | $ 14,563 | $ 10,205 |  |
The 2019 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  | 2,700,000 |
Share-based Payment Arrangement, Expense | $ 956 |  |  |  |

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