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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Jun. 30, 2024
Dec. 31, 2023
Preferred stock, par value (in dollars per share) $ 0.000666 $ 0.000666
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.000666 $ 0.000666
Common stock, shares authorized (in shares) 245,000,000 245,000,000
Common stock, shares issued (in shares) 157,820,072 117,862,081
Common stock, shares outstanding (in shares) 157,820,072 117,862,081
Treasury stock, shares (in shares) 0 2,605,322