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Note 7 - Stockholders' Equity - Warrants (Details)
 3 Months Ended
Mar. 31, 2026
$ / shares
shares
Balance, warrants (in shares) | shares 7,944,618
Balance, exercise price (in dollars per share) | $ / shares $ 1.88
Warrants for common stock sold, warrants (in shares) | shares (67,104)
Warrants for common stock sold, exercise price (in dollars per share) | $ / shares $ 6.63
Balance, warrants (in shares) | shares 7,877,514
Balance, exercise price (in dollars per share) | $ / shares $ 1.84