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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parentheticals) - Series C Convertible Preferred Stock [Member] - shares
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Convertible preferred stock (in shares) 58 132
Conversion of stock, shares issued (in shares) 3,862,000 1,400,000