Note 8 - Warrants - Schedule of Warrant Activity (Details) - $ / shares																1 Months Ended				3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 19, 2025	Aug. 22, 2025	Jul. 24, 2025		Jul. 21, 2025	Jul. 18, 2025	Jul. 11, 2025	Jun. 05, 2025		May 05, 2025	Mar. 17, 2025		Feb. 07, 2025		Jul. 31, 2025	May 31, 2025	Apr. 30, 2025	Mar. 31, 2025	Sep. 30, 2025		Sep. 30, 2025		Dec. 31, 2024
Series F and Series B Warrants [Member]
Outstanding (in shares)																						317,664
Outstanding, weighted average exercise price (in dollars per share)																						$ 4.96
Outstanding, weighted average remaining contractual term (Year)																						2 years 9 months 21 days		2 years 7 months 6 days
Outstanding (in shares)																				2,710,369		2,710,369		317,664
Outstanding, weighted average exercise price (in dollars per share)																				$ 1.7296	[1]	$ 1.7296	[1]	$ 4.96
Exercisable (in shares)																				2,710,369		2,710,369
Exercisable, weighted average exercise price (in dollars per share)	[1]																			$ 1.7296		$ 1.7296
Exercisable, weighted average remaining contractual term (Year)																						2 years 9 months 21 days
Series F Warrants [Member]
Outstanding, weighted average exercise price (in dollars per share)			$ 2.19								$ 1.1
Issued (in shares)		272,599	275,497	456,621		357,143	714,286	671,818	2,054,262		602,846	415,420		450,390
Issued, weighted average exercise price (in dollars per share)		$ 1.8342	$ 1.8149	$ 1.8149	[2]	$ 1.4	$ 1.4	$ 1.1908	$ 1.2169	[3]	$ 0.8294	$ 0.8294	[1]	$ 0.8294	[1]
Warrants exchanged for common stock (in shares)																(142,857)		(125,362)
Warrants exchanged for common stock (in dollars per share)																$ 0.8294		$ 1.1
Warrants exercised (in shares)																				(3,622,918)		(3,622,918)
Exercised warrants, weighted average exercise price (in dollars per share)																						$ 1.04
Outstanding, weighted average exercise price (in dollars per share)			$ 1.8149					$ 1.1908			$ 0.8294	$ 1.2								$ 0.8294		$ 0.8294
Exercise of Series A Warrants (in shares)																				(3,622,918)		(3,622,918)
Exercise of Series A Warrants (in dollars per share)																						$ 1.04
Series A and B Warrants [Member]
Outstanding (in shares)																						4,628,312
Outstanding, weighted average exercise price (in dollars per share)																		$ 1.2				$ 1.9445
Outstanding, weighted average remaining contractual term (Year)																						4 years		4 years 9 months
Issued (in shares)																	3,057,622		2,582,234
Issued, weighted average exercise price (in dollars per share)																	$ 0.8294		$ 1.2036
Outstanding (in shares)																				102,579		102,579		4,628,312
Outstanding, weighted average exercise price (in dollars per share)																	$ 0.8294		$ 1.2	$ 1.9445	[1]	$ 1.9445	[1]	$ 1.9445
Exercisable (in shares)																				102,579		102,579
Exercisable, weighted average exercise price (in dollars per share)	[1]																			$ 1.9445		$ 1.9445
Exercisable, weighted average remaining contractual term (Year)																						4 years
Series A Warrants [Member]
Warrants exercised (in shares)																						(63,017)
Exercised warrants, weighted average exercise price (in dollars per share)																						$ 1.9445
Outstanding, weighted average exercise price (in dollars per share)																				$ 1.9445		$ 1.9445
Exercise of Series A Warrants (in shares)																						(63,017)
Exercise of Series A Warrants (in dollars per share)																						$ 1.9445
Series B Warrants, Before Down Round Trigger [Member]
Issued, weighted average exercise price (in dollars per share)																						$ 0.8294
Warrants exercised (in shares)																						(2,220,688)
Exercised warrants, weighted average exercise price (in dollars per share)																						$ 0.9639
Reclassification of Series B Warrants (in shares)																						7,881,884
Exercise of Series A Warrants (in shares)																						(2,220,688)
Exercise of Series A Warrants (in dollars per share)																						$ 0.9639
Reclassified (in shares)																						(7,881,884)
Series B Warrants, Down Round Trigger [Member]
Warrants exercised (in shares)																						(7,868,924)
Exercised warrants, weighted average exercise price (in dollars per share)	[1]																					$ 0.8294
Reclassification of Series B Warrants (in shares)																						7,881,884
Reclassification of Series B Warrants (in dollars per share)	[1]																					$ 0.8294
Exercise of Series A Warrants (in shares)																						(7,868,924)
Exercise of Series A Warrants (in dollars per share)	[1]																					$ 0.8294
Reclassified (in shares)																						(7,881,884)

[1] Reflects the exercise price after the May 2025 Down Round Trigger on May 5, 2025 as described above.

[2] Reflects the exercise price after the August 2025 Down Round Trigger on August 22, 2025 as described above.

[3] Reflects the exercise price after the July 2025 Down Round Trigger on July 11, 2025 as described above.