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Note 9 - Warrants to Purchase Common Stock - Schedule of Warrants or Rights (Details) - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Outstanding, warrants (in shares) 530 355  
Outstanding, Weighted - Average Exercise Price (in dollars per share) $ 11.7 $ 15.92  
Outstanding, Average Remaining Term in Years (Year) 4 years 9 months 10 days 5 years 9 months 7 days 7 years 5 months 23 days
Granted, warrants (in shares) 226 511  
Granted, Weighted - Average Exercise Price (in dollars per share) $ 0.01 $ 1.62  
Exercised, warrants (in shares) (226) (336)  
Exercised, Weighted - Average Exercise Price (in dollars per share) $ 0.01 $ 0.83  
Outstanding, warrants (in shares) 530 530  
Outstanding, Weighted - Average Exercise Price (in dollars per share) $ 11.7 $ 11.7