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Note 8 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended
	Apr. 30, 2018	Dec. 31, 2017	Jan. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Proceeds from Issuance of Common Stock		$ 142,600	$ 163,700
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Net				435,000
Proceeds from Stock Options Exercised				$ 4,202	$ 1,850
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total				$ 79,700
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				2 years 292 days
Subsequent Event [Member]
Proceeds from Issuance of Common Stock	$ 168,700
Common Stock [Member]
Stock Issued During Period, Shares, New Issues		9,700,000	14,100,000
Share Price		$ 15.50	$ 12.20
Payments of Stock Issuance Costs		$ 7,400	$ 8,800
Common Stock [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues	6,900,000
Share Price	$ 26
Payments of Stock Issuance Costs	$ 9,300

X

- Definition

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

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

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