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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Common stock, shares authorized (in shares) 170,000,000 170,000,000
Common stock, shares issued (in shares) 14,411,432 13,977,868
Common stock, shares outstanding (in shares) 14,411,432 13,977,868
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001