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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 500,000,000 500,000,000
Common stock, shares issued (in shares) 29,763,475 27,858,539
Common stock, shares outstanding (in shares) 29,763,475 27,858,539
Warrant issued (in shares) 2,553,192 2,553,192
Warrant outstanding (in shares) 2,553,192 2,553,192
Series A Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares) 50,000 50,000
Preferred stock, shares issued (in shares) 2,281 2,812
Preferred stock, shares outstanding (in shares) 2,281 2,812
Preferred stock, liquidation preference $ 2,281,000 $ 2,812,000
Series 1 Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares) 97,000 97,000
Preferred stock, shares issued (in shares) 31,501 36,677
Preferred stock, shares outstanding (in shares) 31,501 36,677
Preferred stock, liquidation preference $ 31,501,000 $ 36,677,000
Series 2 Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares) 60,000 60,000
Preferred stock, shares issued (in shares) 46,000 46,000
Preferred stock, liquidation preference $ 0 $ 0
Preferred stock, shares converted (in shares) 46,000 46,000