Note 11 - Share Based Compensation and Employee Benefit Plans (Details) - Stock Option (USD $)	12 Months Ended
Dec. 31, 2014
Stock Option [Abstract]
Outstanding options, shares	3,642,156
Outstanding options, weighted average exercise price	$ 16.41
Outstanding options, weighted average remaining contractual life	6 years 7 days
Expected to vest after December 31, 2014	1,950,078
Expected to vest after December 31, 2014	$ 23.61
Expected to vest after December 31, 2014	7 years 178 days
Expected to vest after December 31, 2014	$ 16,465,041
Vested and exercisable at December 31, 2014	1,114,912
Vested and exercisable at December 31, 2014	$ 12.47
Vested and exercisable at December 31, 2014	3 years 156 days
Vested and exercisable at December 31, 2014	22,420,955
Granted	459,058
Granted	$ 30.27
Exercised	(902,238)
Exercised	$ 12.21
Forfeited	(16,000)
Forfeited	$ 26.86
Outstanding options, shares	3,182,976
Outstanding options, weighted average exercise price	$ 19.55
Outstanding options, weighted average remaining contractual life	6 years 7 days
Outstanding options, aggregate intrinsic value	$ 39,792,666

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-Subparagraph (c)(1)(iv)(3)

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Gross number of share options (or share units) granted during the period.

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No definition available.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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No definition available.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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Number of share options (or share units) exercised during the current period.

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