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Note 14 - Share-based Payments (Tables) | 9 Months Ended
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Sep. 30, 2018
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Three months ended September 30, |  |  | Three months ended September 30, |
|  | 2018 |  |  | 2017* |
|  | Number of shares |  |  | Weighted average exercise price per share |  |  | Number of shares |  |  | Weighted average exercise price per share |
Outstanding, beginning of period |  |  | 734,196 |  |  | $ | 42.39 |  |  |  | 363,608 |  |  | $ | 16.79 |
Granted |  |  | 23,800 |  |  |  | 57.78 |  |  |  | 327,150 |  |  |  | 55.49 |
Exercised |  |  | (15,782 | ) |  |  | 8.00 |  |  |  | (30,051 | ) |  |  | 6.67 |
Forfeited |  |  | (8,635 | ) |  |  | 59.20 |  |  |  | (1,050 | ) |  |  | 51.87 |
Expired |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Outstanding, end of period |  |  | 733,579 |  |  |  | 43.43 |  |  |  | 659,657 |  |  |  | 36.39 |
Options exercisable, end of period |  |  | 326,887 |  |  | $ | 29.00 |  |  |  | 223,043 |  |  | $ | 14.30 |
|  | Nine months ended September 30, |  |  | Nine months ended September 30, |
|  | 2018 |  |  | 2017* |
|  | Number of shares |  |  | Weighted average exercise price per share |  |  | Number of shares |  |  | Weighted average exercise price per share |
Outstanding, beginning of period |  |  | 653,571 |  |  | $ | 36.69 |  |  |  | 474,501 |  |  | $ | 12.67 |
Granted |  |  | 163,366 |  |  |  | 62.80 |  |  |  | 360,025 |  |  |  | 54.13 |
Exercised |  |  | (44,498 | ) |  |  | 9.49 |  |  |  | (165,673 | ) |  |  | 7.79 |
Forfeited |  |  | (38,860 | ) |  |  | 50.46 |  |  |  | (9,196 | ) |  |  | 22.08 |
Expired |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Outstanding, end of period |  |  | 733,579 |  |  |  | 43.43 |  |  |  | 659,657 |  |  |  | 36.39 |
Options exercisable, end of period |  |  | 326,887 |  |  | $ | 29.00 |  |  |  | 223,043 |  |  | $ | 14.30 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  | Options outstanding |  |  | Options exercisable |
Exercise price |  | Number outstanding |  |  | Weighted average exercise price per share |  |  | Weighted average remaining contractual life (years) |  |  | Aggregate intrinsic value |  |  | Number exercisable |  |  | Weighted average exercise price per share |  |  | Weighted average remaining contractual life (years) |  |  | Aggregate intrinsic value |
$5.52 | - | $8.56 |  |  | 60,573 |  |  | $ | 6.89 |  |  |  | 1.2 |  |  | $ | 2,960 |  |  |  | 60,573 |  |  | $ | 6.89 |  |  |  | 1.2 |  |  | $ | 2,960 |
$10.16 | - | $19.95 |  |  | 108,063 |  |  |  | 16.39 |  |  |  | 2.7 |  |  |  | 4,254 |  |  |  | 95,563 |  |  |  | 15.98 |  |  |  | 2.6 |  |  |  | 3,801 |
$21.10 | - | $27.53 |  |  | 72,500 |  |  |  | 23.76 |  |  |  | 3.3 |  |  |  | 2,319 |  |  |  | 52,500 |  |  |  | 24.78 |  |  |  | 3.0 |  |  |  | 1,626 |
$35.25 | - | $37.35 |  |  | 14,375 |  |  |  | 35.89 |  |  |  | 4.7 |  |  |  | 286 |  |  |  | 10,625 |  |  |  | 36.11 |  |  |  | 4.4 |  |  |  | 209 |
$43.15 | - | $47.00 |  |  | 18,500 |  |  |  | 44.19 |  |  |  | 5.3 |  |  |  | 214 |  |  |  | 8,000 |  |  |  | 43.75 |  |  |  | 5.3 |  |  |  | 96 |
$53.20 | - | $58.65 |  |  | 337,275 |  |  |  | 55.67 |  |  |  | 5.6 |  |  |  | 108 |  |  |  | 99,626 |  |  |  | 55.21 |  |  |  | 5.4 |  |  |  | 68 |
$64.10 | - | $64.10 |  |  | 122,293 |  |  |  | 64.10 |  |  |  | 6.7 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
|  |  |  |  | 733,579 |  |  | $ | 43.43 |  |  |  | 4.8 |  |  | $ | 10,141 |  |  |  | 326,887 |  |  | $ | 29.00 |  |  |  | 3.4 |  |  | $ | 8,760 |

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