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Note 8 - Outstanding Warrants - Schedule of Warrants or Rights (Details) - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Outstanding, warrants (in shares) 55 95  
Outstanding, Weighted - Average Exercise Price (in dollars per share) $ 15.92 $ 2.59 $ 2.59
Outstanding, Average Remaining Term in Years (Year) 7 years 5 months 23 days 3 years 11 months 12 days 4 years 11 months 12 days
Granted, warrants (in shares) 527 292  
Granted, Weighted - Average Exercise Price (in dollars per share) $ 10.47 $ 0.01  
Exercised, warrants (in shares) (227) (332)  
Exercised, Weighted - Average Exercise Price (in dollars per share) $ 0.01 $ 0.32  
Outstanding, warrants (in shares) 355 55