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Note 17 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  |  |  | Weighted average |  |  |  |
|  |  |  |  | Weighted |  |  | remaining |  |  |  |
|  | Number of |  |  | average |  |  | contractual life |  |  | Aggregate |
|  | options |  |  | exercise price |  |  | (years) |  |  | intrinsic value |
Shares issuable under options - December 31, 2017 |  |  | 1,753,275 |  |  | $ | 36.03 |  |  |  |  |  |  |  |  |
Granted |  |  | 470,000 |  |  |  | 67.32 |  |  |  |  |  |  |  |  |
Exercised |  |  | (278,975 | ) |  |  | 26.60 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (46,875 | ) |  |  | 39.66 |  |  |  |  |  |  |  |  |
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 |  |  |  | 3.2 |  |  | $ | 38,054 |
Options exercisable - End of year |  |  | 645,975 |  |  | $ | 47.48 |  |  |  | 2.0 |  |  | $ | 19,695 |
Stock Options Exercised [Table Text Block] |
|  | 2019 |  |  | 2018 |
Number of options exercised |  |  | 632,075 |  |  |  | 278,975 |
Aggregate fair value |  | $ | 43,873 |  |  | $ | 17,823 |
Intrinsic value |  |  | 21,934 |  |  |  | 10,403 |
Amount of cash received |  |  | 21,939 |  |  |  | 7,420 |
Tax benefit recognized |  | $ | 1,322 |  |  | $ | 73 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2019 |  |  | 2018 |
Risk free rate |  |  | 2.1 | % |  |  | 2.2 | %
Expected life in years |  |  | 4.75 |  |  |  | 4.75 |
Expected volatility |  |  | 28.8 | % |  |  | 29.7 | %
Dividend yield |  |  | 0.1 | % |  |  | 0.1 | %
Weighted average fair value per option granted |  | $ | 19.87 |  |  | $ | 19.41 |

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