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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands				12 Months Ended
	Nov. 21, 2019	Nov. 18, 2019	Aug. 06, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 08, 2017
Maximum Aggregate Offering Price							$ 200,000
Stock Issued During Period, Shares, New Issues		43,621	10,455
Shares Issued, Price Per Share	$ 1.69	$ 1.45	$ 5.50
Proceeds from Issuance of Common Stock		$ 53,500	$ 53,400	$ 58,500	$ 53,400	$ 134,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	11,765
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.01
Proceeds from Issuance of Warrants	$ 19,882			$ 19,882

X

- Definition

Represents the maximum aggregate offering price of common stock, preferred stock, depository shares, stock purchase contracts, warrants and units.

+ References

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

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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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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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