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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Mar. 31, 2024
Dec. 31, 2023
Dec. 30, 2020
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 300,000,000 300,000,000  
Common stock, shares issued (in shares) 128,433,721 128,422,851  
Common stock, shares outstanding (in shares) 128,433,721 128,422,851