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Note 20 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2019 |  |  | 2,001,600 |  |  | $ | 58.96 |  |  |  |  |  |  |  |  |
Granted |  |  | 547,250 |  |  |  | 85.79 |  |  |  |  |  |  |  |  |
Exercised |  |  | (344,225 | ) |  |  | 35.86 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (14,500 | ) |  |  | 70.07 |  |  |  |  |  |  |  |  |
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 |  |  |  | 3.1 |  |  | $ | 147,597 |
Options exercisable - December 31,2021 |  |  | 978,188 |  |  | $ | 72.14 |  |  |  | 2.1 |  |  | $ | 73,420 |
Stock Options Exercised [Table Text Block] |
|  | Year ended December 31, |
|  | 2021 |  |  | 2020 |
Number of options exercised |  |  | 292,450 |  |  |  | 344,225 |
Aggregate fair value |  | $ | 32,808 |  |  | $ | 25,919 |
Intrinsic value |  |  | 14,440 |  |  |  | 13,576 |
Amount of cash received |  |  | 18,367 |  |  |  | 12,343 |
Tax benefit recognized |  | $ | 937 |  |  | $ | 102 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | As at December 31, |
|  | 2021 |  |  | 2020 |
Risk free rate |  |  | 0.8 | % |  |  | 0.2 | %
Expected life in years |  |  | 4.75 |  |  |  | 4.41 |
Expected volatility |  |  | 39.4 | % |  |  | 36.5 | %
Dividend yield |  |  | 0.2 | % |  |  | 0.1 | %
Weighted average fair value per option granted |  | $ | 46.12 |  |  | $ | 28.33 |

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