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Note 11 - Common Stock Warrants - Outstanding Warrants (Details) - $ / shares
shares in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Outstanding warrants (in shares) 7,382,447 2,305,519
Outstanding warrants, weighted-average exercise price (in dollars per share) $ 1.82 $ 7.7
Warrants granted (in shares) 1,000,000 0
Warrants granted, weighted average exercise price (in dollars per share) $ 0.14 $ 0
Warrants exercised (in shares) (0) 0
Warrants exercised, weighted-average exercise price (in dollars per share) $ 0 $ 0
Warrants expired (in shares) 0 0
Warrants expired, weighted average exercise price (in dollars per share) $ 0 $ 0
Warrants exercised (in shares) 0 0
Outstanding warrants (in shares) 8,382,447 2,305,519
Outstanding warrants, weighted-average exercise price (in dollars per share) $ 1.6 $ 7.7