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Note 10 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] |
Year Ended December 31, |  | 2015 |
Shares purchased pursuant to 2009 ESPP |  |  | 71,811 |
Weighted average per share price of shares purchased |  | $ | 90.04 |
Weighted average per share discount from market value for shares purchased |  | $ | 15.89 |
As of December 31, |  | 2015 |
Shares available for purchase pursuant to 2009 ESPP |  |  | 467,660 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | RSUs |  |  | Weighted average grant date fair value |
Balance, December 31, 2014 |  |  | 464,758 |  |  | $ | 36.33 |
Granted |  |  | 171,185 |  |  |  | 88.74 |
Vested |  |  | (216,833 | ) |  |  | 62.74 |
Forfeited |  |  | (8,036 | ) |  |  | 57.73 |
Balance, December 31, 2015 |  |  | 411,074 |  |  |  | 59.13 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Shares subject to options |  |  | Weighted average exercise price |  |  | Aggregate intrinsic value (in millions) |  |  | Weighted average remaining contractual term (in years) |
Balance, December 31, 2014 |  |  | 6,834 |  |  | $ | 6.79 |  |  | $ | 0.5 |  |  |  | 0.8 |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Expired |  |  | (2,000 | ) |  |  | 3.23 |  |  |  |  |  |  |  |  |
Exercised |  |  | (4,834 | ) |  |  | 8.27 |  |  |  |  |  |  |  |  |
Balance, December 31, 2015 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercisable, December 31, 2015 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
Year Ended December 31, |  | 2015 |  |  | 2014 |  |  | 2013 |
Per share intrinsic value of non-vested stock granted |  | $ | 88.74 |  |  | $ | 68.99 |  |  | $ | 43.13 |
Weighted average per share discount for compensation expense recognized under the 2009 ESPP |  |  | 15.89 |  |  |  | 11.92 |  |  |  | 8.81 |
Total intrinsic value of stock options exercised (in millions) |  |  | 0.5 |  |  |  | 3.1 |  |  |  | 8.7 |
Fair value of non-vested stock that vested during the period (in millions) |  |  | 19.3 |  |  |  | 18.9 |  |  |  | 8.4 |
Stock-based compensation recognized in Consolidated Statements of Operations, as a component of selling, general and administrative expense (in millions) |  |  | 11.9 |  |  |  | 7.4 |  |  |  | 6.6 |
Tax benefit recognized in Consolidated Statements of Operations (in millions) |  |  | 4.2 |  |  |  | 2.6 |  |  |  | 2.3 |
Cash received from options exercised and shares purchased under all share-based arrangements (in millions) |  |  | 6.5 |  |  |  | 4.9 |  |  |  | 5.2 |
Tax deduction realized related to stock options exercised (in millions) |  |  | 7.6 |  |  |  | 8.4 |  |  |  | 6.5 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of employee stock purchase plan activity. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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