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Note 11 - Quarterly Financial Information (Unaudited) - Schedule of Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues	$ 8,983	$ 7,763	$ 4,787	$ 4,820	$ 4,602	$ 10,987	$ 25,842	$ 6,826	$ 26,353	$ 48,257	$ 13,608
Net Loss	$ (4,503)	$ (11,528)	$ (16,281)	$ (22,832)	$ (18,135)	$ (14,621)	$ 4,901	$ (15,164)	$ (55,144)	$ (43,019)	$ (45,189)
Basic and diluted net loss per share (in dollars per share)	$ (0.06)	$ (0.16)	$ (0.22)	$ (0.31)					$ (0.75)	$ (0.59)	$ (0.68)
Basic net (loss) income per share (in dollars per share)					$ (0.25)	$ (0.20)	$ 0.07	$ (0.21)
Diluted net (loss) income per share (in dollars per share)					$ (0.25)	$ (0.20)	$ 0.06	$ (0.21)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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