Note 11 - Common Stock (Details Textual) $ / shares in Units, $ in Thousands							1 Months Ended			3 Months Ended				6 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2025 USD ($) shares	Mar. 18, 2025 USD ($) shares	Mar. 07, 2025 $ / shares	Feb. 11, 2025 USD ($) shares	Sep. 13, 2024 USD ($)	May 13, 2024 USD ($) $ / shares shares	Mar. 31, 2025	May 31, 2024 $ / shares shares	Aug. 31, 2023	Sep. 30, 2025 USD ($) $ / shares shares	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) shares	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) shares	Dec. 31, 2024 USD ($) $ / shares shares
Common Stock, Shares, Issued (in shares) | shares										1,662,921					1,662,921		556,902
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares			$ 0.0001							$ 0.0001					$ 0.0001		$ 0.0001
Stock Issued During Period, Shares, New Issues (in shares) | shares								277,059
Proceeds from Issuance of Common Stock															$ 2,337	$ 0
Payments of Stock Issuance Costs															68	$ 112
Class of Warrant or Right, Exercises During Period (in shares) | shares																0
Proceeds from Warrant Exercises															109	$ 0
Stock Issued During Period, Value, New Issues										$ 429	$ 1,908	$ 1,700	$ 15
Dividends, Common Stock															$ 0
Common Stock, Shares, Outstanding (in shares) | shares										1,662,921					1,662,921		556,902
Series A Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares								277,059
Class of Warrant or Right, Exercises During Period (in shares) | shares														7,524	7,524
Proceeds from Warrant Exercises														$ 109	$ 109
Class of Warrant or Right, Expired During Period (in shares) | shares														269,535
Series B Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares								415,589
Common Stock Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares								$ 14.45
Registered Public Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares						277,059
Proceeds from Issuance or Sale of Equity, Gross						$ 4,000
Proceeds from Issuance or Sale of Equity						3,300
Proceeds from Issuance of Common Stock						1,400
Proceeds from Issuance of Warrants						$ 1,900
Payments for Services, Cash Fee						7.00%
Payments of Stock Issuance Costs						$ 280
Payments of Reimbursement of Expenses						$ 100
Registered Public Offering [Member] | Series A Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares						277,059
Class of Warrant or Right, Issued with Common Stock (in shares) | shares						1
Warrants and Rights Outstanding, Term (Year)						1 year
Registered Public Offering [Member] | Series B Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares						415,589
Class of Warrant or Right, Issued with Common Stock (in shares) | shares						1.5
Warrants and Rights Outstanding, Term (Year)						5 years
Registered Public Offering [Member] | Common Stock Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares						$ 14.45
Registered Public Offering, Placement Agent [Member] | Common Stock Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares						11,083
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares						$ 15.9
Warrants and Rights Outstanding, Term (Year)						5 years
Conversion of Warrant, Ownership Percent						4.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights, Percent of Closing Price per Share						110.00%
Distribution Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares															172,700		193,161
Proceeds from Issuance of Common Stock															$ 1,800		$ 1,200
Commission Fee					3.00%
Maximum Reimbursement Expenses					$ 40
Professional Fees, Bringdown					5
Common Stock, Aggregate Offering Price					$ 10,000
Payments for Commissions															53		37
Proceeds from Issuance of Common Stock, Net															1,600		$ 1,100
Professional Fees															$ 108
Statera Securities Purchase Agreement [Member]
Stock Issued During Period, Value, New Issues				$ 1,200
Statera Securities Purchase Agreement [Member] | Series A Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares				360
Statera Securities Purchase Agreement [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares				55,635
Statera Securities Purchase Agreement [Member] | Common Stock [Member] | Series A Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares				360
Mast Hill Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares		29,800													235,792
Proceeds from Issuance of Common Stock															$ 783
Proceeds from Issuance of Common Stock, Net															$ 741
Equity Issuable, Maximum Value		$ 25,000
Statera and Avenue Securities Purchase Agreement [Member]
Stock Issued During Period, Value, New Issues	$ 500
Statera and Avenue Securities Purchase Agreement [Member] | Series A Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares	131
Statera and Avenue Securities Purchase Agreement [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares	55,704
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio			17				17		100						17