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Note 3 - Basis of Presentation and Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

		Three Months Ended September 30,								Nine Months Ended September 30,
		2018				2017				2018				2017
Basic net (loss) income per common share calculation:
Net (loss) income		$	(6,719,730	)		$	5,096,856			$	(12,798,872	)		$	(3,154,181	)
Accretion of Series A cumulative preferred dividends			—				(366,641	)			(85,993	)			(912,946	)
Undistributed earnings allocated to participating securities			—				(1,838,354	)
Deemed dividend related to the make-whole provision for the conversion of Series A preferred stock into common			—				—				(8,167,895	)			—
Net (loss) income attributable to common			(6,719,730	)			2,891,861				(21,052,760	)			(4,067,127	)
Weighted average common shares outstanding, basic			50,572,001				13,937,869				47,777,757				11,709,128
Net (loss) income per share of common, basic		$	(0.13	)		$	0.21			$	(0.44	)		$	(0.35	)
Diluted net income (loss) per common share calculation:
Net income (loss) attributable to common			(6,719,730	)			2,891,861				(21,052,760	)			(4,067,127	)
Change in fair value of warrant liability			—				—				—				(18,909,792	)
Interest on convertible debt			—				28,891				—				—
Diluted net loss			(6,719,730	)			2,920,752				(21,052,760	)			(22,976,919	)
Weighted average common shares outstanding, basic			50,572,001				13,937,869				47,777,757				11,709,128
Common stock equivalents arising from stock options			—				20,608				—				—
Common stock equivalents arising from warrants			—				—				—				816,579
Common stock equivalents arising from convertible debt			—				756,376				—				—
Common stock equivalents			50,572,001				14,714,853				47,777,757				12,525,707
Diluted net loss per share of common		$	(0.13	)		$	0.20			$	(0.44	)		$	(1.83	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

		Three Months Ended September 30,								Nine Months Ended September 30,
		2018				2017				2018				2017
Convertible debt			—				—				—				213,879
Common stock warrants			31,303,012				14,003,608				31,303,012				447,721
Stock options			3,213,797				2,521,605				3,213,797				2,545,989
Unvested restricted stock awards			—				4,599				—				4,599
			34,516,809				16,529,812				34,516,809				3,212,188

X

- Definition

Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
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-Name Accounting Standards Codification
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-SubTopic 10
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