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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) $ 0.000001 $ 0.000001
Preferred stock, shares authorized (in shares) 20,000,000 20,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 10,257,078 10,257,078
Common stock, shares outstanding (in shares) 10,257,078 10,257,078
Series B Convertible Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.000001 $ 0.000001
Preferred stock, shares authorized (in shares) 18,000,000 18,000,000
Preferred stock, shares issued (in shares) 872,766 872,766
Preferred stock, shares outstanding (in shares) 872,766 872,766