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Note 8 - Warrants to Purchase Common Stock - Schedule of Warrants or Rights (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Outstanding, warrants (in shares) 355 55  
Outstanding, Weighted - Average Exercise Price (in dollars per share) $ 15.92 $ 2.59  
Outstanding, Average Remaining Term in Years (Year) 5 years 9 months 7 days 7 years 5 months 23 days 4 years 11 months 12 days
Granted, warrants (in shares) 511 527  
Granted, Weighted - Average Exercise Price (in dollars per share) $ 1.62 $ 10.47  
Exercised, warrants (in shares) (336) (227)  
Exercised, Weighted - Average Exercise Price (in dollars per share) $ 0.83 $ 0.01  
Outstanding, warrants (in shares) 530 355  
Outstanding, Weighted - Average Exercise Price (in dollars per share) $ 11.7 $ 15.92