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Note 21 - 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 |  |  | Aggregate |
|  | Number of |  |  | average |  |  | contractual life |  |  | intrinsic |
|  | options |  |  | exercise price |  |  | (years) |  |  | value |
Shares issuable under options - December 31, 2021 |  |  | 2,550,875 |  |  | $ | 89.34 |  |  |  |  |  |  |  |  |
Granted |  |  | 837,500 |  |  |  | 95.69 |  |  |  |  |  |  |  |  |
Exercised |  |  | (305,125 | ) |  |  | 54.99 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (30,250 | ) |  |  | 110.73 |  |  |  |  |  |  |  |  |
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 |  |  |  | 3.2 |  |  | $ | 87,846 |
Options exercisable - December 31, 2023 |  |  | 1,378,039 |  |  | $ | 94.61 |  |  |  | 2.2 |  |  | $ | 47,249 |
Stock Options Exercised [Table Text Block] |
|  | Year ended December 31, |
|  | 2023 |  |  | 2022 |
Number of options exercised |  |  | 600,500 |  |  |  | 305,125 |
Aggregate fair value |  | $ | 68,629 |  |  | $ | 41,528 |
Intrinsic value |  |  | 26,571 |  |  |  | 16,779 |
Amount of cash received |  |  | 42,058 |  |  |  | 24,749 |
Tax benefit recognized |  | $ | 131 |  |  | $ | 754 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | As at December 31, |
|  | 2023 |  |  | 2022 |
Risk free rate |  |  | 4.9 | % |  |  | 4.2 | %
Expected life in years |  |  | 4.75 |  |  |  | 4.75 |
Expected volatility |  |  | 42.3 | % |  |  | 41.2 | %
Dividend yield |  |  | 0.3 | % |  |  | 0.3 | %
Weighted average fair value per option granted |  | $ | 44.78 |  |  | $ | 38.22 |

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