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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Sep. 30, 2019
Dec. 31, 2018
Common stock, shares authorized (in shares) 170,000,000 170,000,000
Common stock, shares issued (in shares) 14,398,701 13,977,868
Common stock, shares outstanding (in shares) 14,398,701 13,977,868
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001