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Note 21 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 2020 |  |  | 2,190,125 |  |  | $ | 69.22 |  |  |  |  |  |  |  |  |
Granted |  |  | 682,500 |  |  |  | 136.38 |  |  |  |  |  |  |  |  |
Exercised |  |  | (292,450 | ) |  |  | 49.38 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (29,300 | ) |  |  | 80.15 |  |  |  |  |  |  |  |  |
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 |  |  |  | 3.1 |  |  | $ | 25,723 |
Options exercisable - December 31, 2022 |  |  | 1,271,220 |  |  | $ | 83.31 |  |  |  | 2.1 |  |  | $ | 18,801 |
Stock Options Exercised [Table Text Block] |
|  | Year ended December 31, |
|  | 2022 |  |  | 2021 |
Number of options exercised |  |  | 305,125 |  |  |  | 292,450 |
Aggregate fair value |  | $ | 41,528 |  |  | $ | 32,808 |
Intrinsic value |  |  | 16,779 |  |  |  | 14,440 |
Amount of cash received |  |  | 24,749 |  |  |  | 18,368 |
Tax benefit recognized |  | $ | 754 |  |  | $ | 937 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | As at December 31, |
|  | 2022 |  |  | 2021 |
Risk free rate |  |  | 4.2 | % |  |  | 0.8 | %
Expected life in years |  |  | 4.75 |  |  |  | 4.75 |
Expected volatility |  |  | 41.2 | % |  |  | 39.4 | %
Dividend yield |  |  | 0.3 | % |  |  | 0.2 | %
Weighted average fair value per option granted |  | $ | 38.22 |  |  | $ | 46.12 |

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