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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 600,000,000 600,000,000
Common stock, shares issued (in shares) 556,489 437,807
Common stock, shares outstanding (in shares) 556,489 437,807
Series B Convertible Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 1,000 $ 1,000
Preferred stock, shares issued (in shares) 100 100
Preferred stock, shares outstanding (in shares) 100 100
Series C Convertible Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 1,000 $ 1,000
Preferred stock, shares issued (in shares) 0 2,150
Preferred stock, shares outstanding (in shares) 0 2,150
Series E Convertible Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 1,000 $ 1,000
Preferred stock, shares issued (in shares) 0 1,200
Preferred stock, shares outstanding (in shares) 0 1,200
Conversion of Series F Preferred Stock Into Common Stock [Member]    
Preferred stock, par value (in dollars per share) $ 1,000 $ 1,000
Preferred stock, shares issued (in shares) 2,583 0
Preferred stock, shares outstanding (in shares) 2,583 0
Series G Convertible Preferred Stock and Related Warrants [Member]    
Preferred stock, par value (in dollars per share) $ 1,000 $ 1,000
Preferred stock, shares issued (in shares) 500 0
Preferred stock, shares outstanding (in shares) 500 0