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Note 7 - Stockholders' Equity - Warrants (Details)
 6 Months Ended
Jun. 30, 2024
$ / shares
shares
Balance , number of common stock warrants (in shares) | shares 141,889
Balance, weighted average exercise price (in dollars per share) | $ / shares $ 94.5
Warrants for common stock sold , number of common stock warrants (in shares) | shares 67,104
Warrants for common stock sold, weighted average exercise price (in dollars per share) | $ / shares $ 6.6
Balance , number of common stock warrants (in shares) | shares 208,993
Balance as, weighted average exercise price (in dollars per share) | $ / shares $ 66.3