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Note 10 - Net Loss Per Share - Schedule of Antidilutive Securities (Details) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Number of potential common shares excluded (in shares) | 4,317,405 | 375,199
Employee Stock Option [Member] |  |
Number of potential common shares excluded (in shares) | 487,941 | 117,301
Series A Convertible Preferred Stock [Member] |  |
Number of potential common shares excluded (in shares) |  | 55,835
Series B Convertible Preferred Stock [Member] |  |
Number of potential common shares excluded (in shares) | 774,983 |
Warrant [Member] |  |
Number of potential common shares excluded (in shares) | 3,054,481 | 202,063

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- 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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