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Note 14 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted average |  |  |  |  |
|  |  |  |  |  | Weighted |  |  | remaining |  |  |  |  |
|  | Number of |  |  | average |  |  | contractual life |  |  | Aggregate |
|  | options |  |  | exercise price |  |  | (years) |  |  | intrinsic value |
Shares issuable under options - Beginning of period |  |  | 2,337,573 |  |  | $ | 120.06 |  |  |  |  |  |  |  |  |
Granted |  |  | 615,000 |  |  |  | 142.20 |  |  |  |  |  |  |  |  |
Exercised |  |  | (455,934 | ) |  |  | 73.73 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (75,890 | ) |  |  | 144.43 |  |  |  |  |  |  |  |  |
Shares issuable under options - December 31, 2023 |  |  | 2,420,749 |  |  | $ | 133.65 |  |  |  | 2.5 |  |  | $ | 68,849 |
Options exercisable - End of period |  |  | 1,044,891 |  |  | $ | 120.60 |  |  |  | 1.6 |  |  | $ | 43,351 |
Stock Options Exercised [Table Text Block] |
|  | 2023 |
Number of options exercised |  |  | 455,934 |
Aggregate fair value |  | $ | 66,499 |
Intrinsic value |  |  | 32,883 |
Amount of cash received |  |  | 33,616 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2023 |
Risk free rate |  |  | 4.0 | %
Expected life in years |  |  | 4.20 |
Expected volatility |  |  | 33.5 | %
Dividend yield |  |  | 0.6 | %
Weighted average fair value per option granted |  | $ | 44.19 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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