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Note 15 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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, 2011 |  |  | 1,895,550 |  |  | $ | 20.83 |  |  |  |  |  |  |  |  |
Granted |  |  | 367,000 |  |  |  | 31.48 |  |  |  |  |  |  |  |  |
Exercised |  |  | (363,850 | ) |  |  | 19.15 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (169,500 | ) |  |  | 32.38 |  |  |  |  |  |  |  |  |
Shares issuable under options - December 31, 2012 |  |  | 1,729,200 |  |  | $ | 22.31 |  |  |  |  |  |  |  |  |
Granted |  |  | 422,000 |  |  |  | 31.35 |  |  |  |  |  |  |  |  |
Exercised |  |  | (464,150 | ) |  |  | 16.20 |  |  |  |  |  |  |  |  |
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 |  |  |  | 2.6 |  |  | $ | 24,176 |
Options exercisable - End of period |  |  | 560,450 |  |  | $ | 29.19 |  |  |  | 1.7 |  |  | $ | 12,148 |
Stock Options Exercised [Table Text Block] |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Number of options exercised |  |  | 558,150 |  |  |  | 464,150 |  |  |  | 363,850 |
Aggregate fair value |  | $ | 27,973 |  |  | $ | 16,780 |  |  | $ | 11,198 |
Intrinsic value |  |  | 17,223 |  |  |  | 9,313 |  |  |  | 4,265 |
Amount of cash received |  |  | 10,750 |  |  |  | 7,467 |  |  |  | 6,933 |
Tax benefit recognized |  | $ | 5,856 |  |  | $ | 3,148 |  |  | $ | 1,438 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Risk free rate |  |  | 0.9 | % |  |  | 0.4 | % |  |  | 0.4 | %
Expected life in years |  |  | 4.75 |  |  |  | 4.75 |  |  |  | 4.75 |
Expected volatility |  |  | 25.5 | % |  |  | 37.5 | % |  |  | 40.3 | %
Dividend yield |  |  | 0.8 | % |  |  | 0.0 | % |  |  | 0.0 | %
Weighted average fair value per option granted |  | $ | 10.52 |  |  | $ | 10.13 |  |  | $ | 10.87 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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