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Note 13 - Subsequent Events (Details Textual) - USD ($) |  |  |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 25, 2019 | Feb. 26, 2019 | Feb. 25, 2019 | Feb. 18, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Feb. 28, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 28, 2015
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 |  |  |
Series C Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  |  |  |  | 420 | 298 | 132 |
Conversion of Stock, Shares Issued |  |  |  |  |  |  |  | 28,000,000 | 19,862,000 | 1,400,000 |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  | $ 1,000 | $ 1,000 |  | $ 1,000
Convertible Preferred Stock, Conversion Price1 |  |  |  |  |  |  |  |  | $ 0.015 |  |
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  |  |  |  |  | 2,150 | 2,570 |  |
Series E Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  |  | 600 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  | $ 1,000 |  | $ 1,000 | $ 1,000 |  |
Convertible Preferred Stock, Conversion Price1 |  |  |  |  |  |  |  | $ 0.02544 |  |  |
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  |  |  |  |  | 1,200 | 0 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Number of Series C and Series E Preferred Stock Exchanged for Series F Convertible Preferred Stock |  |  |  | 2,763 |  |  |  |  |  |  |
Subsequent Event [Member] | Term Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount, Canceled |  | $ 250,000 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | First Closing [Member] | Series I Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 16,666,666 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 0.015 |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term |  |  | 5 years |  |  |  |  |  |  |  |
Subsequent Event [Member] | Second Closing [Member] | Series I Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 33,333,332 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Third Closing [Member] | Series I Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 33,333,332 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series G Convertible Preferred Stock and Related Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock and Related Warrants, Authorized | 1,000 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock and Related Warrants, Maximum | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock and Related Warrants Issued |  | 500 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series G Convertible Preferred Stock and Related Warrants [Member] | First Closing [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock and Related Warrants, Maximum |  | $ 250,000 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series G Convertible Preferred Stock and Related Warrants [Member] | Second Closing [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock and Related Warrants, Maximum |  |  | $ 250,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series G Convertible Preferred Stock and Related Warrants [Member] | Third Closing [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock and Related Warrants, Maximum |  |  | $ 250,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series F Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  | $ 1,000 |  |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price1 |  |  |  | $ 0.015 |  |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price, Percentage of Volume Weighted Average Price of the Common Stock |  |  |  | 90.00% |  |  |  |  |  |  |
Subsequent Event [Member] | Series C Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  | 0 |  |  |  |  |  |  |
Subsequent Event [Member] | Series G Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price1 |  |  | $ 0.015 |  |  |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price, Percentage of Volume Weighted Average Price of the Common Stock |  |  | 90.00% |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series E Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  | 0 |  |  |  |  |  |  |
Conversion of Series C Preferred Stock Into Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  |  |  | 587 |  |  |  |
Conversion of Stock, Shares Issued |  |  |  |  |  |  | 39,140,000 |  |  |  |
Conversion of Series F Preferred Stock Into Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  | 180 |  |  |  |  |  |
Conversion of Stock, Shares Issued |  |  |  |  | 20,000,000 |  |  |  |  |  |

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