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Note 8 - Outstanding Warrants - Schedule of Warrants or Rights (Details) - $ / shares
shares in Thousands
 6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Outstanding, warrants (in shares) 355  
Outstanding, Weighted - Average Exercise Price (in dollars per share) $ 15.92  
Outstanding, Average Remaining Term in Years (Year) 6 years 4 months 24 days 7 years 5 months 23 days
Granted, warrants (in shares) 373  
Granted, Weighted - Average Exercise Price (in dollars per share) $ 1.53  
Exercised, warrants (in shares) (223)  
Exercised, Weighted - Average Exercise Price (in dollars per share) $ 1.24  
Outstanding, warrants (in shares) 505  
Outstanding, Weighted - Average Exercise Price (in dollars per share) $ 11.78