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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001  
Preferred stock, authorized (in shares) 2,500,000 2,500,000  
Preferred stock, issued (in shares) 0 0  
Common stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001
Common stock, authorized (in shares) 50,000,000 50,000,000  
Common stock, issued (in shares) 9,475,443 5,727,310  
Common stock, outstanding (in shares) 9,475,443 5,727,310