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Note 13 - Share-based Compensation - Black-Scholes Option Pricing Model (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  | 34.70% |  | 33.70%
Expected volatility |  | 34.70% |  | 33.70%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  | 2.90% |  | 0.80%
Risk-free interest rate |  | 2.90% |  | 0.80%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price |  | $ 77.28 |  | $ 57.34
Exercise price (in dollars per share) |  | $ 77.28 |  | $ 57.34
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term |  | 6 years 2 months 12 days |  | 6 years 2 months 12 days
Expected term (years) (Year) |  | 6 years 2 months 12 days |  | 6 years 2 months 12 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 30.37 | $ 19.6
Weighted-average grant date fair value (in dollars per share) |  |  | $ 30.37 | $ 19.6
Minimum [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate | 36.60% |  |  |
Expected volatility | 36.60% |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | 3.60% |  |  |
Risk-free interest rate | 3.60% |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price | $ 111.54 |  |  |
Exercise price (in dollars per share) | $ 111.54 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term | 6 years 2 months 12 days |  |  |
Expected term (years) (Year) | 6 years 2 months 12 days |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 37.81 |  |  |
Weighted-average grant date fair value (in dollars per share) | $ 37.81 |  |  |
Maximum [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate | 40.60% |  |  |
Expected volatility | 40.60% |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | 3.90% |  |  |
Risk-free interest rate | 3.90% |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price | $ 167.98 |  |  |
Exercise price (in dollars per share) | $ 167.98 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term | 6 years 9 months 18 days |  |  |
Expected term (years) (Year) | 6 years 9 months 18 days |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 71.17 |  |  |
Weighted-average grant date fair value (in dollars per share) | $ 71.17 |  |  |

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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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