v3.19.3

Note 7 - Stockholders' Deficit (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2010 | Jun. 30, 2019
Preferred Stock, Dividends Per Share, Declared | $ 0 | $ 0 |  |  |
Common Stock, Shares Authorized | 5,313,200 | 148,000,000 |  |  | 95,000,000
Common Stock, Par or Stated Value Per Share | $ 0.001 | $ 0.001 |  |  | $ 0.001
Common Stock, Shares, Outstanding, Ending Balance | 701,808 | 19,548,969 |  |  | 5,807,877
Common Stock, Dividends, Per Share, Declared | $ 0 |  |  |  |
Conversion of Preferred Stock to Common Stock [Member] |  |  |  |  |
Equity, Convertible, Aggregate Proceeds Trigger | $ 40 |  |  |  |
Equity, Convertible, Stock Price Trigger | $ 1.00 |  |  |  |
Noncumulative Dividends for Holders of Series B Convertible Preferred Stock [Member] |  |  |  |  |
Dividends Payable, Amount Per Share | 0.0251 |  |  |  |
Noncumulative Dividends for Holders of Series A Convertible Preferred Stock [Member] |  |  |  |  |
Dividends Payable, Amount Per Share | $ 0.0182 |  |  |  |
Convert Notes and Accrued Interest to Series A Preferred Stock [Member] |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  |  |  | 3,531,889 |
Convert Notes and Accrued Interest to Series B Preferred Stock [Member] |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  |  | 6,469,356 |  |
Series A Redeemable Convertible Preferred Stock Without Giving Effect To The Reverse Stock Split [Member] |  |  |  |  |
Redeemable convertible preferred stock, shares issued (in shares) | 2,034,548 | 56,672,658 |  |  | 0
Redeemable convertible preferred stock, shares outstanding (in shares) | 2,034,548 | 56,672,658 |  |  | 0
Series B Redeemable Convertible Preferred Stock Without Giving Effect To The Reverse Stock Split [Member] |  |  |  |  |
Redeemable convertible preferred stock, shares issued (in shares) | 1,833,387 | 51,069,262 |  |  |
Temporary Equity, Remaining Shares Outstanding Requirements To Elect One Director | 10,000,000 |  |  |  |
Redeemable convertible preferred stock, shares outstanding (in shares) | 1,833,387 | 51,069,262 |  |  | 0
Series B Convertible Preferred Stock [Member] |  |  |  |  |
Temporary Equity, Liquidation Preference Per Share | $ 0.3133 |  |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |
Temporary Equity, Liquidation Preference Per Share | $ 0.2276 |  |  |  |

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