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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Common stock, shares authorized (in shares) 170,000,000 170,000,000
Common stock, shares issued (in shares) 7,814,572 1,812,483
Common stock, shares outstanding (in shares) 7,814,572 1,812,483
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001