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Note 15 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of options |  | Weighted average exercise price |  | Weighted average remaining contractual life (years) |  | Aggregate intrinsic value
Shares issuable under options - December 31, 2013 |  |  | 1,687,050 |  |  | $ | 26.25 |  |  |  |  |  |  |  |  |
Granted |  |  | 343,000 |  |  |  | 49.57 |  |  |  |  |  |  |  |  |
Exercised |  |  | (558,150 | ) |  |  | 19.26 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (8,000 | ) |  |  | 31.28 |  |  |  |  |  |  |  |  |
Shares issuable under options - December 31, 2014 |  |  | 1,463,900 |  |  | $ | 34.35 |  |  |  |  |  |  |  |  |
Granted |  |  | 698,500 |  |  |  | 36.61 |  |  |  |  |  |  |  |  |
Exercised |  |  | (699,400 | ) |  |  | 20.09 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (22,500 | ) |  |  | 38.71 |  |  |  |  |  |  |  |  |
Shares issuable under options - December 31, 2015 |  |  | 1,440,500 |  |  | $ | 28.65 |  |  |  |  |  |  |  |  |
Granted |  |  | 395,000 |  |  |  | 32.94 |  |  |  |  |  |  |  |  |
Exercised |  |  | (144,150 | ) |  |  | 19.83 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (88,500 | ) |  |  | 32.14 |  |  |  |  |  |  |  |  |
Shares issuable under options - December 31, 2016 |  |  | 1,602,850 |  |  | $ | 30.31 |  |  |  | 2.8 |  |  | $ | 11,305 |
Options exercisable - End of year |  |  | 510,975 |  |  | $ | 25.88 |  |  |  | 1.9 |  |  | $ | 5,777 |
Stock Options Exercised [Table Text Block] |
|  | 2016 |  | 2015 |  | 2014
Number of options exercised |  |  | 144,150 |  |  |  | 699,400 |  |  |  | 558,150 |
Aggregate fair value |  | $ | 5,222 |  |  | $ | 35,516 |  |  | $ | 27,973 |
Intrinsic value |  |  | 2,364 |  |  |  | 21,463 |  |  |  | 17,223 |
Amount of cash received |  |  | 2,858 |  |  |  | 14,053 |  |  |  | 10,750 |
Tax benefit recognized |  | $ | - |  |  | $ | 91 |  |  | $ | 5,856 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2016 |  | 2015 |  | 2014
Risk-free rate |  |  | 1.1 | % |  |  | 1.0 | % |  |  | 0.9 | %
Expected life in years |  |  | 4.75 |  |  |  | 4.75 |  |  |  | 4.75 |
Expected volatility |  |  | 33.0 | % |  |  | 28.6 | % |  |  | 25.5 | %
Dividend yield |  |  | 0.3 | % |  |  | 0.2 | % |  |  | 0.8 | %
Weighted average fair value per option granted |  | $ | 9.64 |  |  | $ | 11.91 |  |  | $ | 10.52 |

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