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Note 7 - Preferred Stock (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | May 31, 2017 | Feb. 28, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 05, 2018
Preferred Stock, Par or Stated Value Per Share |  |  |  |  | $ 0.01 | $ 0.01 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  | $ 0.03 |  |  |
Conversion from Series C Convertible Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  | 420 | 298 | 132 |
Conversion of Stock, Shares Issued |  |  |  |  | 28,000,000 | 19,862,000 | 1,400,000 |
Warrants Issued in Connection with Series C Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  | 51,333,331 |  |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued |  |  |  | $ 1,695,869 |  |  |  |
Series G Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  | 47,169,812
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  | $ 0.02544
Warrants and Rights Outstanding, Term |  |  |  |  |  |  |  | 3 years
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  | $ 1,000 |  |  |
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  | $ 1,000 | $ 1,000 |  |
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  |  | 100 | 100 |  |
Convertible Preferred Stock, Total Conversion Shares |  |  |  |  | 285,714 |  |  |
Preferred Stock, Value, Issued, Ending Balance |  |  |  |  | $ 76,095 | $ 76,095 |  |
Series C Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  | $ 1,000 | $ 1,000 | $ 1,000 |  |
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  |  | 2,150 | 2,570 |  |
Convertible Preferred Stock, Total Conversion Shares |  |  |  |  | 143,349,733 |  |  |
Preferred Stock, Value, Issued, Ending Balance |  |  |  |  | $ 705,238 | $ 842,990 |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 3,000 |  |  |  |
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants, Total |  |  |  | $ 2,679,810 |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 983,941 |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  | 420 | 298 | 132 |
Conversion of Stock, Shares Issued |  |  |  |  | 28,000,000 | 19,862,000 | 1,400,000 |
Convertible Preferred Stock, Conversion Price Per Share |  |  |  |  |  | $ 0.05 |  |
Convertible Preferred Stock, Conversion Price1 |  |  |  |  |  | 0.015 |  |
Series D Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 1,000 |  | $ 1,000 | $ 1,000 |  |
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  |  | 0 | 1,000 |  |
Preferred Stock, Value, Issued, Ending Balance |  |  |  |  |  | $ 980,000 |  |
Stock Issued During Period, Shares, New Issues |  |  | 1,000 |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  | 1,000 |  |  |
Conversion of Stock, Shares Issued |  |  |  |  | 66,666,666 |  |  |
Proceeds From Issuance Of Convertible Preferred Stock, Net of Issuance Cost |  |  | $ 980,000 |  |  |  |  |
Series E Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  | $ 1,000 |  |  | $ 1,000 | $ 1,000 |  |
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  |  | 1,200 | 0 |  |
Convertible Preferred Stock, Total Conversion Shares |  |  |  |  | 47,169,812 |  |  |
Preferred Stock, Value, Issued, Ending Balance |  |  |  |  | $ 1,190,000 |  |  |
Stock Issued During Period, Shares, New Issues | 600 |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  | 600 |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price1 |  |  |  |  | $ 0.02544 |  |  |
Proceeds From Issuance Of Convertible Preferred Stock, Net of Issuance Cost | $ 600,000 | $ 590,000 |  |  |  |  |  |

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