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Note 6 - Stockholders' Equity (Details Textual) - USD ($)	1 Months Ended		3 Months Ended
	Jun. 30, 2015	Jun. 30, 2011	Mar. 31, 2016	Mar. 31, 2015
Common Stock [Member] | Private Placement 2011 [Member]
Stock Issued During Period, Shares, New Issues				47,588
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised			0	66,667
Proceeds from Warrant Exercises				$ 0
Common Stock [Member]
Stock Issued During Period, Shares, New Issues	5,520,000
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
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
Beneficial Ownership after Conversion		9.99%
Notice Period Associated with Beneficial Ownership Percentage Limitation Convertible Notes		61 days
Class of Warrant or Right, Outstanding			2,965,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Net			243,031	351,698
Proceeds from Stock Options Exercised			$ 2,530,000	$ 2,878,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 69,971,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 146 days

X

- Definition

Percentage amount the holder would beneficially own of the company's outstanding common stock.

+ References

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Notice period associated with beneficial ownership percentage limitation, convertible notes.

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- Definition

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

+ References

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

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-Publisher FASB
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-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
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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.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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- Definition

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

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

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

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