Note 7 - Stockholders' Equity (Deficit) - RSU Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	9 Months Ended
	Sep. 30, 2025	Sep. 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)	258,730	7,981
Granted, weighted average grant date fair value (in dollars per share)	$ 1.4	$ 16.5
Cancelled (in shares)	(1,158)	(43)
Cancelled, weighted average grant date fair value (in dollars per share)	$ 284.01	$ 504.5
Vested (in shares)	(147,825)	(687)
Vested, weighted average grant date fair value (in dollars per share)	$ 3.28	$ 753
Outstanding (in shares)	117,040	10,306
Outstanding, weighted average grant date fair value (in dollars per share)	$ 16.4	$ 233
Vested as of September 30, 2025 (in shares)	10,243	2,981
Vested, weighted average grant date fair value (in dollars per share)	$ 166.5	$ 820
Unvested (in shares)	106,797	7,325
Unvested, weighted average grant date fair value (in dollars per share)	$ 2.01	$ 25.5
Vested and released, weighted average grant date fair value (in dollars per share)	$ 3.28	$ 753