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Consolidated Statements of Cash Flows (Parentheticals) - shares
 1 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Series A Convertible Preferred Stock [Member]            
Convertible preferred stock (in shares) 71 0 71 71 717 1,412
Common stock conversion (in shares) 202,857     202,857 2,048,570 1,882,667
Series B Convertible Preferred Stock [Member]            
Convertible preferred stock (in shares)   0 525 1,550    
Common stock conversion (in shares)       4,428,571 0 0