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Note 19 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted average |  |  |  |  |
|  |  |  |  |  | Weighted |  |  | remaining |  |  | Aggregate |
|  | Number of |  |  | average |  |  | contractual life |  |  | intrinsic |
|  | options |  |  | exercise price |  |  | (years) |  |  | value |
Shares issuable under options - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2022 |  |  | 3,053,000 |  |  | $ | 94.30 |  |  |  |  |  |  |  |  |
Granted |  |  | 815,000 |  |  |  | 106.75 |  |  |  |  |  |  |  |  |
Exercised |  |  | (600,500 | ) |  |  | 70.04 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (25,250 | ) |  |  | 119.82 |  |  |  |  |  |  |  |  |
Shares issuable under options - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2023 |  |  | 3,242,250 |  |  | $ | 101.73 |  |  |  |  |  |  |  |  |
Granted |  |  | 698,600 |  |  |  | 151.34 |  |  |  |  |  |  |  |  |
Exercised |  |  | (581,800 | ) |  |  | 77.50 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (47,250 | ) |  |  | 107.03 |  |  |  |  |  |  |  |  |
Shares issuable under options - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2024 |  |  | 3,311,800 |  |  | $ | 116.37 |  |  |  | 3.1 |  |  | $ | 77,229 |
Options exercisable - December 31, 2024 |  |  | 989,086 |  |  | $ | 93.63 |  |  |  | 2.2 |  |  | $ | 41,879 |
Stock Options Exercised [Table Text Block] |
|  | Year ended December 31, |
|  | 2024 |  |  | 2023 |
Number of options exercised |  |  | 581,800 |  |  |  | 600,500 |
Aggregate fair value |  | $ | 77,847 |  |  | $ | 68,629 |
Intrinsic value |  |  | 32,758 |  |  |  | 26,571 |
Amount of cash received |  |  | 45,089 |  |  |  | 42,058 |
Tax benefit recognized |  | $ | 1,051 |  |  | $ | 131 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | As at December 31, |
|  | 2024 |  |  | 2023 |
Risk free rate |  |  | 4.1 | % |  |  | 4.9 | %
Expected life in years |  |  | 4.75 |  |  |  | 4.75 |
Expected volatility |  |  | 43.1 | % |  |  | 42.3 | %
Dividend yield |  |  | 0.2 | % |  |  | 0.3 | %
Weighted average fair value per option granted |  | $ | 63.19 |  |  | $ | 44.78 |
|  | As at December 31, |
|  | 2024 |
Risk free rate |  |  | 4.3 | %
Discount rate |  |  | 5.8 | %
Expected volatility |  |  | 32.5 | %
Expected life in years |  |  | 4.00 |
Dividend yield |  |  | 0.2 | %

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