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Note 7 - Stockholders' Equity (Details Textual) - USD ($)	1 Months Ended	9 Months Ended
	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2011
Private Placement 2011 [Member] | Common Stock [Member]
Proceeds from Warrant Exercises		$ 0	$ 0
Stock Issued During Period, Shares, New Issues		2,395,700	285,713
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised		2,965,477	343,813
Private Placement 2011 [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				4,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 3.60
Common Stock [Member]
Stock Issued During Period, Shares, New Issues	5,500,000
Sale of Stock, Price Per Share	$ 24.75
Proceeds from Issuance or Sale of Equity	$ 128,200,000
Payments of Stock Issuance Costs	$ 8,400,000
Proceeds from Issuance or Sale of Equity			$ 128,199,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Net		652,749	882,579
Proceeds from Stock Options Exercised		$ 5,720,000	$ 7,915,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 55,400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		2 years 146 days

X

- Definition

Number of share options (or share units) exercised during the current period, net of shares retained for cashless exercises.

+ References

No definition available.

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X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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X

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
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X

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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
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X

- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB
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-Section 45
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X

- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

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- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

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- Definition

Number of non-option equity instruments exercised by participants.

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- Definition

Number of new stock issued during the period.

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-Topic 210
-SubTopic 10
-Section S99
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