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Consolidated Statements of Cash Flows (Parentheticals) - shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Series C Convertible Preferred Stock [Member] |  |  |
Convertible preferred stock (in shares) | 420 | 298 | 132
Conversion of stock, shares issued (in shares) | 28,000,000 | 19,862,000 | 1,400,000
Series D Convertible Preferred Stock [Member] |  |  |
Convertible preferred stock (in shares) | 1,000 |  |
Conversion of stock, shares issued (in shares) | 66,666,666 |  |

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