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Note 12 - Subsequent Events (Details Textual) - USD ($) |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 05, 2018 | Feb. 28, 2018 | Feb. 28, 2018 | Feb. 28, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Conversion of Stock, Shares Converted |  |  |  |  | 298 | 123 |
Conversion of Stock, Shares Issued |  |  |  |  | 19,862,000 | 1,400,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  | $ 0.07 |
Proceeds from Issuance of Convertible Preferred Stock |  |  |  |  | $ 980,000 |  | $ 2,679,810
Subsequent Event [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised |  |  | 5,000,000 |  |  |  |
Subsequent Event [Member] | Series E Convertible Preferred Stock [Member] |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock | $ 600,000 |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price Per Share | $ 0.08 |  |  |  |  |  |
Convertible Preferred Stock, Total Conversion Shares | 7,500,000 |  |  |  |  |  |
Subsequent Event [Member] | Warrants in Connection with Senior Promissory Note [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Term |  | 5 years |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 178,571 | 178,571 | 178,571 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 0.042 | $ 0.042 | $ 0.042 |  |  |
Subsequent Event [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  | $ 50,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.00% | 5.00% | 5.00% |  |  |
Conversion From Series D Convertible Preferred Stock To Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  | 300 |  |  |
Conversion of Stock, Shares Issued |  |  |  | 20,000,000 |  |  |

X
- Definition Period of time between issuance and maturity of warrant, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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