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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Mar. 31, 2017
Dec. 31, 2016
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) 300,000,000 300,000,000
Common stock, shares issued (in shares) 56,218,567 55,235,233
Common stock, shares outstanding (in shares) 56,218,567 55,235,233
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) 2,868 2,868
Preferred stock, shares outstanding (in shares) 2,868 2,868