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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2021
Dec. 31, 2020
Common stock, shares authorized (in shares) 170,000,000 170,000,000
Common stock, shares issued (in shares) 7,853,759 7,814,572
Common stock, shares outstanding (in shares) 7,853,759 7,814,572
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001