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Note 3 - Summary of Significant Accounting Policies - Antidilutive Securities Excluded From Computation of Earnings Per Share (Details) - shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Common shares issuable under the conversion feature of preferred shares (in shares)	7,312,723	9,215,816
Convertible Preferred Shares [Member]
Common shares issuable under the conversion feature of preferred shares (in shares)	872,766	2,796,929
Employee Stock Option [Member]
Common shares issuable under the conversion feature of preferred shares (in shares)	2,613,299	2,592,229
Warrant [Member]
Common shares issuable under the conversion feature of preferred shares (in shares)	3,826,658	3,826,658

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://www.xbrl.org/2003/role/presentationRef
-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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