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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		1 Months Ended		12 Months Ended
	Aug. 06, 2018	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 08, 2017
Stock Issued During Period, Shares, New Issues	10,455	17,864	6,061
Shares Issued, Price Per Share	$ 5.50	$ 5.15	$ 8.50
Proceeds from Issuance of Common Stock	$ 53,400	$ 86,250	$ 47,750	$ 53,400	$ 134,000
Maximum Aggregate Offering Price							$ 200,000

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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X

- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Per share or per unit amount of equity securities issued.

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- Definition

Number of new stock issued during the period.

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