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Note 3 - Basis of Presentation and Summary of Significant Accounting Policies - Outstanding Dilutive Securities (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Anti-dilutive securities (in shares)	34,516,809	16,529,812	34,516,809	3,212,188
Convertible Debt Securities [Member]
Anti-dilutive securities (in shares)				213,879
Warrant [Member]
Anti-dilutive securities (in shares)	31,303,012	14,003,608	31,303,012	447,721
Employee Stock Option [Member]
Anti-dilutive securities (in shares)	3,213,797	2,521,605	3,213,797	2,545,989
Restricted Stock [Member]
Anti-dilutive securities (in shares)		4,599		4,599

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

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