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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Mar. 31, 2020
Dec. 31, 2019
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
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) 4,125,754 4,111,082
Common stock, shares outstanding (in shares) 4,125,754 4,111,082