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Consolidated Statements of Cash Flows (Parentheticals) - shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2014
Conversion from Series A Convertible Preferred Stock to Common Stock [Member] |  |
Convertible preferred stock (in shares) |  | 71
Conversion of stock, shares issued (in shares) |  | 202,857
Conversion from Series C Convertible Preferred Stock to Common Stock [Member] |  |
Convertible preferred stock (in shares) | 132 |
Conversion of stock, shares issued (in shares) | 1,400,000 |
Conversion from Series B Convertible Preferred Stock to Common Stock [Member] |  |
Convertible preferred stock (in shares) |  | 1,550
Conversion of stock, shares issued (in shares) |  | 4,428,571

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