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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parentheticals) - USD ($)
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Conversion of Series C Preferred Stock Into Series F Preferred Stock [Member]    
Convertible preferred stock (in shares) 1,686 1,563
Conversion of Series E Preferred Stock Into Series F Preferred Stock [Member]    
Convertible preferred stock (in shares) 9,393,937 1,200
Conversion of Series C and Series E Preferred Stock Into Series F Preferred Stock [Member]    
Conversion of stock, shares issued (in shares)   2,763
Series G Convertible Preferred Stock Issued in Exchange for Cancellation of Term notes Payable [Member]    
Convertible preferred stock (in shares)   250
Convertible note, value   $ 250,000
Conversion of Series C Preferred Stock Into Common Stock [Member]    
Convertible preferred stock (in shares)   587
Conversion of stock, shares issued (in shares)   39
Conversion of Series F Preferred Stock Into Common Stock [Member]    
Convertible preferred stock (in shares)   461
Conversion of stock, shares issued (in shares)   147
Conversion of Series I Preferred Stock Into Common Stock [Member]    
Convertible preferred stock (in shares) 700  
Conversion of stock, shares issued (in shares) 4,087,412