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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