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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Sep. 30, 2016
Dec. 31, 2015
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0
Preferred stock, authorized (in shares) 10,000,000  
Preferred stock, issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.0001 $ 0
Common stock, authorized (in shares) 75,000,000  
Common stock, issued (in shares) 10,648,407 7,490,288
Common stock, outstanding (in shares) 10,648,407 7,490,288