Note 3 - Stock Based Compensation (Details) - Stock Option Activity (2014 and 2003 Stock Option Plan [Member], USD $)	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
2014 and 2003 Stock Option Plan [Member]
Note 3 - Stock Based Compensation (Details) - Stock Option Activity [Line Items]
Number of Options	9,962,000	9,962,000	9,228,000
Weighted Average Exercise Price	$ 6.42	$ 6.42	$ 4.45
Weighted Average Remaining Contractual Term (Years)		2 years 9 months	1 year 222 days
Aggregate Intrinsic Value (in thousands)	$ 267,200	$ 267,200	$ 186,169
Exercisable at June 30, 2014	8,136,000	8,136,000
Exercisable at June 30, 2014	$ 3.47	$ 3.47
Exercisable at June 30, 2014		2 years 87 days
Exercisable at June 30, 2014	$ 242,324	$ 242,324
Granted		991,000
Granted		$ 24.75
Exercised	(182,000)	(238,000)
Exercised		$ 5.26
Forfeited		(19,000)
Forfeited		$ 15.48

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently 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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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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

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

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

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

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