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v3.20.1

Note 11 - Subsequent Events (Details Textual) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 24, 2020 USD ($) $ / shares shares | Jan. 21, 2020 | Apr. 30, 2019 | Mar. 23, 2020 shares | Dec. 31, 2019 shares | Dec. 31, 2018 shares
Conversion of Stock, Shares Issued |  |  |  |  | 296,390 | 95
Conversion of Series H Preferred Stock Into Common Stock [Member] |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  | 1,570 |
Conversion of Stock, Shares Issued |  |  |  |  | 296,160 |
Subsequent Event [Member] | Series J Convertible Preferred Stock [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 300 |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ | $ 300,000 |  |  |  |  |
Convertible Preferred Stock, Conversion Price1 | $ / shares | $ 2 |  |  |  |  |
Subsequent Event [Member] | Conversion of Series H Preferred Stock Into Common Stock [Member] |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  | 1,686 |  |
Subsequent Event [Member] | Conversion of Series I Preferred Stock Into Common Stock [Member] |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  | 700 |  |
Subsequent Event [Member] | Conversion of Series H and Series I Preferred Stock Into Common Stock [Member] |  |  |  |  |  |
Conversion of Stock, Shares Issued |  |  |  | 13,481,349 |  |
Reverse Stock Split [Member] |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  |  | 500 |  |  |
Reverse Stock Split [Member] | Subsequent Event [Member] |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 2,000 |  |  |  |

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