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Note 21 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2018 |  |  | 1,897,425 |  |  | $ | 45.08 |  |  |  |  |  |  |  |  |
Granted |  |  | 960,000 |  |  |  | 70.99 |  |  |  |  |  |  |  |  |
Exercised |  |  | (632,075 | ) |  |  | 34.71 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (223,750 | ) |  |  | 61.41 |  |  |  |  |  |  |  |  |
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 |  |  |  | 3.2 |  |  | $ | 43,606 |
Options exercisable - December 31,2020 |  |  | 747,975 |  |  | $ | 60.51 |  |  |  | 2.3 |  |  | $ | 21,407 |
Stock Options Exercised [Table Text Block] |
|  | Year ended December 31,
|  |  | 2020 |  |  |  | 2019 |
Number of options exercised |  |  | 344,225 |  |  |  | 632,075 |
Aggregate fair value |  | $ | 25,919 |  |  | $ | 43,873 |
Intrinsic value |  |  | 13,576 |  |  |  | 21,934 |
Amount of cash received |  |  | 12,343 |  |  |  | 21,939 |
Tax benefit recognized |  | $ | 102 |  |  | $ | 1,322 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | As at December 31,
|  |  | 2020 |  |  |  | 2019 |
Risk free rate |  |  | 0.2 | % |  |  | 2.1 | %
Expected life in years |  |  | 4.41 |  |  |  | 4.75 |
Expected volatility |  |  | 36.5 | % |  |  | 28.8 | %
Dividend yield |  |  | 0.1 | % |  |  | 0.1 | %
Weighted average fair value per option granted |  | $ | 28.33 |  |  | $ | 19.87 |

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