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Note 12 - Stockholders' Equity - Outstanding Warrants (Details)
shares in Thousands
 6 Months Ended
Jun. 30, 2023
$ / shares
shares
Outstanding warrants (in shares) | shares 2,306
Outstanding warrants, weighted-average exercise price (in dollars per share) | $ / shares $ 7.70
Warrants granted (in shares) | shares 5,076
Warrants granted, weighted average exercise price (in dollars per share) | $ / shares $ 1.30
Warrants expired (in shares) | shares 0
Warrants expired, weighted average exercise price (in dollars per share) | $ / shares $ 0
Outstanding warrants (in shares) | shares 7,382
Outstanding warrants, weighted-average exercise price (in dollars per share) | $ / shares $ 2.18