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Note 7 - Stockholders' Equity - RSU Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Outstanding (in shares) 52,040 7,293
Outstanding, weighted average grant date fair value (in dollars per share) $ 34.26 $ 324.64
Granted (in shares) 858,997 72,194
Granted, weighted average grant date fair value (in dollars per share) $ 0.95 $ 2.1
Vested and released (in shares) (25,000) 0
Vested and released, weighted average grant date fair value (in dollars per share) $ 1.06 $ 0
Outstanding (in shares) 886,037 78,415
Outstanding, weighted average grant date fair value (in dollars per share) $ 2.9 $ 28.57
Vested (in shares) 12,437 8,015
Vested, weighted average grant date fair value (in dollars per share) $ 137.44 $ 255.33
Unvested (in shares) 873,600 70,400
Unvested, weighted average grant date fair value (in dollars per share) $ 0.98 $ 2.75