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Note 4 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Note 4 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions [Line Items]
Weighted average fair value per share of options granted during the period (in Dollars per share)	$ 7.75
Weighted average fair value per share of employee stock purchase plan rights granted during the period (in Dollars per share)	$ 20.39
Employee Stock Option [Member]
Note 4 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions [Line Items]
Expected life (in years)	4 years 211 days	4 years 284 days
Volatility	43.40%	56.40%
Risk-free interest rate	1.56%	0.80%
Expected dividend	0.00%	0.00%
Weighted average fair value per share of options granted during the period (in Dollars per share)	$ 7.75	$ 7.54
Employee Stock Purchase Plan [Member]
Note 4 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions [Line Items]
Expected life (in years)	1 year 3 months	1 year 3 months
Volatility	34.60%	46.10%
Risk-free interest rate	0.18%	0.19%
Expected dividend	0.00%	0.00%
Weighted average fair value per share of employee stock purchase plan rights granted during the period (in Dollars per share)	$ 7.18	$ 5.28

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ 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)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809



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-Name Accounting Standards Codification

-Topic 718

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ 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)(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)

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