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Note 7 - Stockholders' Equity - Warrants (Details)
 9 Months Ended
Sep. 30, 2025
$ / shares
shares
Balance, warrants (in shares) | shares 2,467,104
Balance, exercise price (in dollars per share) | $ / shares $ 3.1
Warrants for common stock sold, warrants (in shares) | shares 5,481,514
Warrants for common stock sold, exercise price (in dollars per share) | $ / shares $ 1.33
Balance, warrants (in shares) | shares 7,948,618
Balance, exercise price (in dollars per share) | $ / shares $ 1.88