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Note 7 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	9 Months Ended
	Jan. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2011
Proceeds from Issuance of Common Stock, Net of Issuance Costs	$ 163,700	$ 163,747
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Net		952,000
Proceeds from Stock Options Exercised		$ 7,836	$ 5,720
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 62,100
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		2 years 182 days
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	14,100,000
Share Price	$ 12.20
Payments of Stock Issuance Costs	$ 8,800

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- Definition

The cash inflow from issuance of common stock, net of issuance costs.

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-SubTopic 10
-Section S99
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Unrecognized cost of unvested share-based compensation awards.

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

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