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Note 7 - Stockholders' Equity (Deficit) - RSU Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Outstanding (in shares) 7,293 3,054
Outstanding, weighted average grant date fair value (in dollars per share) $ 324.64 $ 901.5
Granted (in shares) 142,730 901
Granted, weighted average grant date fair value (in dollars per share) $ 1.54 $ 26
Cancelled (in shares) (1,158) (20)
Cancelled, weighted average grant date fair value (in dollars per share) $ 284.01 $ 483
Vested (in shares) (78,825) 687
Vested, weighted average grant date fair value (in dollars per share) $ 5.07 $ 15.06
Outstanding (in shares) 70,040 3,249
Outstanding, weighted average grant date fair value (in dollars per share) $ 26.58 $ 709
Vested as of June 30, 2025 (in shares) 1,243 2,701
Vested, weighted average grant date fair value (in dollars per share) $ 1,363.11 $ 820
Unvested (in shares) 68,797 548
Unvested, weighted average grant date fair value (in dollars per share) $ 2.43 $ 162
Vested and released (in shares) 78,825 (687)
Vested and released, weighted average grant date fair value (in dollars per share) $ 5.07 $ 15.06