Note 10 - Preferred Stock (Details Textual)										1 Months Ended	2 Months Ended	3 Months Ended				9 Months Ended
	Sep. 26, 2025 USD ($) $ / shares shares	Aug. 21, 2025 USD ($) $ / shares shares	Aug. 15, 2025 shares	Jul. 31, 2025 USD ($) $ / shares shares	Jul. 03, 2025 shares	Jun. 25, 2025 USD ($) $ / shares shares	Apr. 29, 2025 USD ($) $ / shares shares	Mar. 31, 2025 USD ($) shares	Feb. 11, 2025 USD ($) shares	May 31, 2024 shares	Sep. 30, 2025 $ / shares shares	Sep. 30, 2025 USD ($) $ / shares shares	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($)	Feb. 10, 2025 shares	Dec. 31, 2024 $ / shares shares
Preferred Stock, Shares Authorized (in shares)											10,000,000	10,000,000				10,000,000			10,000,000
Preferred Stock, Shares Issued (in shares)											3,984	3,984				3,984			0
Preferred 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)										277,059
Stock Issued During Period, Value, New Issues | $												$ 429,000	$ 1,908,000	$ 1,700,000	$ 15,000
Warrant, Down Round Feature, Increase (Decrease) in Equity, Amount | $												$ 0
Payments of Stock Issuance Costs | $																$ 68,000	$ 112,000
Preferred Stock, Shares Outstanding (in shares)											3,984	3,984				3,984			0
Statera Securities Purchase Agreement [Member]
Stock Issued During Period, Value, New Issues | $									$ 1,200,000
Statera Securities Purchase Agreement [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)									55,635
Statera and Avenue Securities Purchase Agreement [Member]
Stock Issued During Period, Value, New Issues | $								$ 500,000
Statera and Avenue Securities Purchase Agreement [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)								55,704
Preferred Purchase Agreement [Member]
Equity Issuable, Maximum Value, Tranched Financing | $							$ 8,400,000
Investor Right to Participate in Financing, Percent							20.00%
Investor Right to Use Financing to Redeem Shares, Percent							25.00%
Payments for Services, Cash Fee							8.00%
Payments for Services, Value of Common Stock, Percent							6.00%
Proceeds from Issuance or Sale of Equity, Gross | $	$ 1,750,000	$ 1,750,000				$ 700,000
Proceeds from Issuance or Sale of Equity | $						585,000
Proceeds from Issuance of Preferred Stock and Preference Stock | $	1,200,000	1,300,000				455,000
Proceeds from Issuance of Warrants | $	$ 321,000	$ 319,000				$ 130,000
Preferred Purchase Agreement [Member] | Tranche Closing Warrants [Member]
Conversion of Warrant, Ownership Percent							30.00%
Warrants and Rights Outstanding, Term (Year)	4 years	4 years					5 years
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
Warrant, Down Round Feature, Increase (Decrease) in Equity, Amount | $		$ 5,000
Class of Warrant or Right, Exercise Price of Warrants or Rights, Percent of Closing Price per Share	110.00%	110.00%
Preferred Purchase Agreement [Member] | Third Tranche Closing, Placement Agent Services [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	29,830
Preferred Purchase Agreement [Member] | Fourth Tranche Closing [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
Second Tranche Closing [Member] | Tranche Closing Warrants [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
Warrant, Down Round Feature, Increase (Decrease) in Equity, Amount | $	$ 4,000
Second Tranche Closing [Member] | Second Tranche Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				64,065
Common Stock Warrants [Member] | Tranche Closing Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 3.04
Fourth Tranche Closing [Member] | Tranche Closing Warrants [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
Warrant, Down Round Feature, Increase (Decrease) in Equity, Amount | $	$ 1,000
Tranche Closing, Placement Agent Services [Member]
Payments of Stock Issuance Costs | $						$ 56,000
Preferred Purchase Agreement, Placement Agent [Member] | Tranche Closing Warrants [Member]
Warrants and Rights Outstanding, Term (Year)						4 years
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		$ 3.52				$ 4.2
Class of Warrant or Right, Exercise Price of Warrants or Rights, Percent of Closing Price per Share						110.00%
Preferred Purchase Agreement, Placement Agent [Member] | Fourth Tranche Closing [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 3.256
Second Tranche Closing, Placement Agent Services [Member]
Payments of Stock Issuance Costs | $		$ 140,000		$ 56,000
Proceeds from Issuance or Sale of Equity | $				625,000
Proceeds from Issuance of Preferred Stock and Preference Stock | $				499,000
Proceeds from Issuance of Warrants | $				$ 126,000
Second Tranche Closing, Placement Agent Services [Member] | Second Tranche Investor Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 3.996
Second Tranche Closing, Placement Agent Services [Member] | Second Tranche Warrants [Member]
Warrants and Rights Outstanding, Term (Year)				4 years
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
Class of Warrant or Right, Exercise Price of Warrants or Rights, Percent of Closing Price per Share				110.00%
Third Tranche Closing [Member] | Tranche Closing Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 3.372
Third Tranche Closing, Placement Agent Services [Member]
Proceeds from Issuance or Sale of Equity | $		$ 1,600,000
Preferred Stock, Shares Outstanding (in shares)											1,750	1,750				1,750
Fourth Tranche Closing, Placement Agent Services [Member]
Payments of Stock Issuance Costs | $	$ 140,000
Proceeds from Issuance or Sale of Equity | $	$ 1,600,000
Preferred Stock, Shares Outstanding (in shares)	1,750
Conversion of Series A Preferred Stock into Common [Member]
Conversion of Stock, Shares Converted (in shares)					88
Conversion of Stock, Shares Issued (in shares)					51,504
Conversion of Series B Preferred Stock into Common [Member]
Conversion of Stock, Shares Converted (in shares)			700								615
Conversion of Stock, Shares Issued (in shares)			244,597								219,899
Series A Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)																		6,000
Preferred Stock, Shares Issued (in shares)											403	403				403
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares											$ 0.0001	$ 0.0001				$ 0.0001
Preferred Stock, Convertible, Conversion Ratio											588	588				588
Conversion of Stock, Initial Ownership Limit											9.90%	9.90%				9.90%
Preferred Stock, Shares Outstanding (in shares)											403	403				403
Series A Preferred Stock [Member] | Statera Securities Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)									360
Series A Preferred Stock [Member] | Statera Securities Purchase Agreement [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)									360
Series A Preferred Stock [Member] | Statera and Avenue Securities Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)								131
Series A Preferred Stock [Member] | Minimum [Member]
Conversion of Stock, Ownership Percent											4.90%	4.90%				4.90%
Series A Preferred Stock [Member] | Maximum [Member]
Conversion of Stock, Ownership Percent											19.90%	19.90%				19.90%
Series B Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)							8,400
Preferred Stock, Shares Issued (in shares)											3,581	3,581				3,581
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares							$ 1,000				$ 0.0001	$ 0.0001				$ 0.0001
Conversion of Stock, Initial Ownership Limit							4.90%
Preferred Stock, Dividend Rate, Percentage							10.00%
Preferred Stock, Convertible, Conversion Price, Percent							90.00%
Preferred Stock, Convertible, Redeemable Price, Percent							115.00%
Maximum Percentage of Net Proceeds from Equity Financing to Redeem Preferred Stock							25.00%
Preferred Stock, Shares Outstanding (in shares)											3,581	3,581				3,581
Series B Preferred Stock [Member] | Preferred Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	1,750	1,750				700
Equity Issuable, Maximum Number of Shares (in shares)							8,400
Equity Issuable, Maximum Number of Shares, Tranche One (in shares)							700
Equity Issuable, Maximum Value of Shares, Tranche One | $							$ 700,000
Equity Issuable, Maximum Number of Shares, Tranche Two (in shares)							700
Equity Issuable, Maximum Value of Shares, Tranche Two | $							$ 700,000
Equity Issuable, Maximum Number of Shares, Tranche Three (in shares)							1,750
Equity Issuable, Maximum Value of Shares, Tranche Three | $							$ 1,750,000
Equity Issuable, Maximum Number of Shares, Tranche Four (in shares)							1,750
Equity Issuable, Maximum Value of Shares, Tranche Four | $							$ 1,750,000
Equity Issuable, Maximum Number of Shares, Tranche Five (in shares)							1,750
Equity Issuable, Maximum Value of Shares, Tranche Five | $							$ 1,750,000
Equity Issuable, Maximum Number of Shares, Tranche Six (in shares)							1,750
Equity Issuable, Maximum Value of Shares, Tranche Six | $							$ 1,750,000
Series B Preferred Stock [Member] | Second Tranche Closing [Member]
Stock Issued During Period, Shares, New Issues (in shares)				700
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				64,065
Proceeds from Issuance or Sale of Equity | $				$ 700
Series B Preferred Stock [Member] | Minimum [Member]
Conversion of Stock, Ownership Percent							4.90%
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares							$ 1.294
Series B Preferred Stock [Member] | Maximum [Member]
Conversion of Stock, Ownership Percent							19.90%