Note 12 - Common Stock Warrants (Details Textual)									1 Months Ended						2 Months Ended	6 Months Ended	9 Months Ended
	Sep. 26, 2025 USD ($) $ / shares shares	Aug. 21, 2025 USD ($) $ / shares shares	Jul. 31, 2025 USD ($) $ / shares shares	Jun. 25, 2025 USD ($) $ / shares shares	Mar. 07, 2025	Feb. 09, 2024 $ / shares shares	Jan. 19, 2024 $ / shares shares	Jan. 11, 2024 $ / shares shares	Mar. 31, 2025	May 31, 2024 USD ($) $ / shares shares	Aug. 31, 2023 shares	Feb. 28, 2023 USD ($) $ / shares shares	May 31, 2022 USD ($)	Feb. 28, 2021 USD ($)	Aug. 31, 2023 USD ($) shares	Jun. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) shares	Aug. 31, 2025 USD ($) $ / shares shares	Apr. 29, 2025	Nov. 30, 2021 $ / shares shares	Jul. 31, 2021 $ / shares shares
Stock Issued During Period, Shares, New Issues (in shares)										277,059
Class of Warrant or Right, Exercises During Period (in shares)																		0
Proceeds from Warrant Exercises | $																	$ 109,000	$ 0
Class of Warrant or Right, Issued, Fair Value | $										$ 70,000		$ 195,000			$ 168,000
ThinkEquity [Member]
Stock Issued During Period, Shares, New Issues (in shares)												11,765
Consulting Agreement [Member]
Consulting Fee, Monthly | $													$ 7,500	$ 5,000
Consulting Fee, Term (Year)														2 years
Second Tranche Closing, Placement Agent Services [Member]
Proceeds from Issuance of Warrants | $			$ 126,000
Preferred Purchase Agreement [Member]
Proceeds from Issuance of Warrants | $	$ 321,000	$ 319,000		$ 130,000
Common Stock Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares										$ 14.45
Common Stock Warrants [Member] | ThinkEquity [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)												589									102
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares												$ 531.25									$ 10,625
Warrants and Rights Outstanding, Term (Year)												4 years									5 years
Proceeds from Issuance of Warrants | $												$ 100
Common Stock Warrants [Member] | Maxim [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)										11,083	2,805				2,805
Warrants and Rights Outstanding, Term (Year)										5 years	5 years				5 years
Class of Warrant or Right, Exercisable (in shares)						781	1,206	765
Class of Warrant or Right, Exercisable, Exercise Price (in dollars per share) | $ / shares						$ 83.64	$ 81.6	$ 113.2
Common Stock Warrants [Member] | Consulting Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)																					30	30
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares																						$ 1,768
Warrants and Rights Outstanding, Term (Year)																						5 years
Common Stock Warrants [Member] | Tranche Closing [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)																61,287
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 3.04	$ 3.372														$ 3.85
Common Stock Warrants [Member] | Tranche Closing, Placement Agent Services [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)																	10,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares																	$ 4.2
Warrants and Rights Outstanding | $			$ 31,000													$ 36,000			$ 77
Series A Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)										277,059
Class of Warrant or Right, Exercises During Period (in shares)																7,524	7,524
Proceeds from Warrant Exercises | $																$ 109,000	$ 109,000
Series B Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)										415,589
Second Tranche Warrants [Member] | Second Tranche Closing [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			64,065
Second Tranche Warrants [Member] | Second Tranche Closing, Placement Agent Services [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			11,068
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 3.795
Warrants and Rights Outstanding, Term (Year)			4 years
Second Tranche Investor Warrants [Member] | Second Tranche Closing, Placement Agent Services [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 3.996
Tranche Closing Warrants [Member] | Second Tranche Closing [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	64,065
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		3.372
Tranche Closing Warrants [Member] | Third Tranche Closing [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 3.372
Tranche Closing Warrants [Member] | Fourth Tranche Closing [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				61,287
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 3.04
Tranche Closing Warrants [Member] | Preferred Purchase Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	195,793	188,842		61,287
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 3.04	$ 3.52		$ 3.85
Warrants and Rights Outstanding, Term (Year)	4 years	4 years																		5 years
Third Tranche Closing, Placement Agent Services [Member] | Preferred Purchase Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	29,830
Two Warrants Issued in August 2025 [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)																			32,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares																			$ 3.64
Warrants and Rights Outstanding | $																			$ 94,000
Fourth Tranche Closing [Member] | Tranche Closing, Placement Agent Services [Member]
Warrants and Rights Outstanding | $	$ 78,000
Fourth Tranche Closing [Member] | Preferred Purchase Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	32,249
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 3.256
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio					17				17		100						17