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CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares
Dec. 31, 2022
Dec. 31, 2021
Preferred stock, par value per share (in dollars per share) $ 0.001 $ 0.001
Preferred stock authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 0
Class A Common Stock    
Common stock, par value per share (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 26,418,732 26,320,199
Common stock, shares outstanding (in shares) 26,418,732 26,320,199
Class B Common Stock    
Common stock, par value per share (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 20,000,000 20,000,000
Common stock, shares issued (in shares) 0 0
Common stock, shares outstanding (in shares) 0 0