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Note 1 - The Company and Summary of Significant Accounting Policies (Details) - shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Anti-dilutive securities | 22,731,781 | 4,553,668 | 8,682,368 | 1,164,905
Exercise of common stock warrants |  |  |  |
Anti-dilutive securities |  |  | 1,813,053 | 0
Conversion of preferred stock into common stock |  |  |  |
Anti-dilutive securities |  |  | 1,163,659 | 1,163,659
Conversion of convertible debentures into common stock |  |  |  |
Anti-dilutive securities |  |  | 5,704,543 | 0
Exercise of common stock options |  |  |  |
Anti-dilutive securities |  |  | 1,113 | 1,246

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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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