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Note 13 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | September 30, 2025 |  |  | December 31, 2024 |
Risk–free interest rate |  |  | 4.13% |  |  |  | 4.40% |
Expected volatility |  |  | 27.0% |  |  |  | 24.1% |
Expected life, in years |  |  | 2.9 |  |  |  | 2.9 |
Expected dividend yield |  |  | 2.80% |  |  |  | 2.63% |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |
Options outstanding at January 1, 2024 |  |  | 588,534 |  |  | $ | 61.30 |  |  | $ | – |
Options granted |  |  | 297,783 |  |  |  | 94.42 |  |  |  | – |
Options exercised |  |  | (219,973 | ) |  |  | 64.73 |  |  |  | – |
Options cancelled |  |  | (35,102 | ) |  |  | 79.20 |  |  |  | – |
Options outstanding at December 31, 2024 |  |  | 631,242 |  |  |  | 74.73 |  |  |  | – |
Options granted |  |  | 306,800 |  |  |  | 91.45 |  |  |  | – |
Options exercised |  |  | (142,364 | ) |  |  | 65.99 |  |  |  | – |
Options cancelled |  |  | (6,333 | ) |  |  | 78.77 |  |  |  | – |
Options outstanding at September 30, 2025 |  |  | 789,345 |  |  | $ | 82.78 |  |  | $ | 30,575,000 |
Options exercisable at September 30, 2025 |  |  | 265,750 |  |  | $ | 73.96 |  |  | $ | 12,636,000 |
Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block] |
Options Outstanding September 30, 2025 |  |  | Exercise Prices |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life in Years |
236,279 |  |  |  | $53.94 | - | $71.64 |  |  |  | $59.34 |  |  |  | 2.1 |
553,066 |  |  |  | $90.62 | - | $106.48 |  |  |  | 92.79 |  |  |  | 4.0 |
789,345 |  |  |  |  |  |  |  |  |  | $82.78 |  |  |  | 3.4 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -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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