Note 13 - Preferred Stock (Details Textual) - USD ($)														2 Months Ended	3 Months Ended			6 Months Ended
	Jun. 18, 2026	Dec. 23, 2025	Dec. 11, 2025	Dec. 09, 2025	Nov. 05, 2025	Sep. 26, 2025	Aug. 21, 2025	Aug. 15, 2025	Jul. 31, 2025	Jun. 25, 2025	Apr. 29, 2025	Mar. 31, 2025	Feb. 11, 2025	Oct. 08, 2025	Jun. 30, 2026	Sep. 26, 2025	Jun. 30, 2025	Jun. 30, 2026	Dec. 31, 2025	Feb. 10, 2025
Preferred Stock, Shares Authorized (in shares)															10,000,000			10,000,000	10,000,000
Preferred Stock, Shares Issued (in shares)															403			403	403
Preferred Stock, Par or Stated Value Per Share (in dollars per share)															$ 0.0001			$ 0.0001	$ 0.0001
Stock Issued During Period, Value, New Issues																	$ 1,908,000
Warrant, Down Round Feature, Increase (Decrease) in Equity, Amount															$ 0
Preferred Stock, Shares Outstanding (in shares)															403			403	403
Conversion of Series B Preferred Stock into Common [Member]
Conversion of Stock, Shares Converted (in shares)					160			700						700
Conversion of Stock, Shares Issued (in shares)					70,220			244,597						252,710
Conversion of Series C Preferred Stock into Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)																		313
Conversion of Stock, Shares Issued (in shares)																		494,533
Convertible Note [Member]
Debt Instrument, Convertible, Stock Price Trigger (in dollars per share)				$ 0.39
Debt Instrument, Convertible, Maximum Shares Issuable, Percent of Outstanding				19.99%
Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)																	260,258
Stock Issued During Period, Value, New Issues																	$ 0
Warrant, Down Round Feature, Increase (Decrease) in Equity, Amount															$ 0
Statera Securities Purchase Agreement [Member]
Proceeds from Issuance or Sale of Equity													$ 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				$ 75,000,000							$ 8,400,000
Proceeds from Issuance or Sale of Equity, Gross							$ 1,750,000			$ 700,000
Proceeds from Issuance or Sale of Equity			$ 11,900,000				$ 1,600			$ 585,000
Investor Right to Participate in Financing, Percent				20.00%
Preferred Purchase Agreement [Member] | Tranche Closing Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	188,842		2,904,528				188,842			61,287
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.6128		$ 2.231	$ 2.231						$ 3.85
Warrant, Down Round Feature, Increase (Decrease) in Equity, Amount	$ 51,000						$ 5,000
Warrants and Rights Outstanding, Term (Year)				5 years			4 years
Class of Warrant or Right, Exercise Price of Warrants or Rights, Percent of Closing Price per Share							110.00%
Conversion of Warrant, Ownership Percent				50.00%
Preferred Purchase Agreement [Member] | First Tranche Investor Warrants [Member]
Proceeds from Issuance or Sale of Equity			$ 5,900,000							$ 187,000
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										29,830
Preferred Purchase Agreement [Member] | Third Tranche Investor Warrants [Member]
Proceeds from Issuance or Sale of Equity							$ 500
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					64,065										64,065
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.6128						$ 3.372
Warrant, Down Round Feature, Increase (Decrease) in Equity, Amount	$ 18,000					$ 4,000
Common Stock Warrants [Member] | Tranche Closing Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 3.04										$ 3.04
Fourth Tranche Closing [Member]
Proceeds from Issuance or Sale of Equity, Gross						$ 1,750,000
Fourth Tranche Closing [Member] | Conversion of Series B Preferred Stock into Common [Member]
Conversion of Stock, Shares Converted (in shares)		1,185																330
Conversion of Stock, Shares Issued (in shares)		743,330																488,975
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									61,287
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.6128					$ 3.04										$ 3.04
Warrant, Down Round Feature, Increase (Decrease) in Equity, Amount	$ 6,000					$ 1,000
Fourth Tranche Closing [Member] | Fourth Tranche Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	195,793					195,793										195,793
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.6128					$ 3.04										$ 3.04
Warrant, Down Round Feature, Increase (Decrease) in Equity, Amount	$ 49,000
Tranche Closing, Placement Agent Services [Member]
Payments of Stock Issuance Costs										$ 56,000
Preferred Purchase Agreement, Placement Agent [Member] | Tranche Closing Warrants [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)							$ 3.52			$ 4.2
Warrants and Rights Outstanding, Term (Year)										4 years
Class of Warrant or Right, Exercise Price of Warrants or Rights, Percent of Closing Price per Share										110.00%
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
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)									$ 3.996
Proceeds from Issuance or Sale of Equity									$ 167,000
Second Tranche Closing, Placement Agent Services [Member] | Second Tranche Warrants [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)									$ 3.795
Warrants and Rights Outstanding, Term (Year)									4 years
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)							$ 3.372
Third Tranche Closing, Placement Agent Services [Member]
Preferred Stock, Shares Outstanding (in shares)															1,590			1,590
Temporary Equity, Carrying Amount, Attributable to Parent															$ 1,100,000			$ 1,100,000	$ 1,000,000
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)															235			235	565
Temporary Equity, Carrying Amount, Attributable to Parent															$ 160,000			$ 160,000	$ 361,000
Fourth Tranche Closing, Placement Agent Services [Member] | Fourth Tranche Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)						32,249										32,249
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 3.256										$ 3.256
Warrants and Rights Outstanding, Term (Year)						4 years										4 years
Class of Warrant or Right, Exercise Price of Warrants or Rights, Percent of Closing Price per Share						110.00%										110.00%
Fourth Tranche Closing, Placement Agent Services [Member] | Fourth Tranche Investor Warrants [Member]
Proceeds from Issuance or Sale of Equity																$ 500,000
Fifth Tranche Closing [Member]
Stock Issued During Period, Shares, New Issues (in shares)	250
Proceeds from Issuance or Sale of Equity, Gross	$ 250,000
Payments of Stock Issuance Costs	$ 241,000
Preferred Stock, Shares Outstanding (in shares)															250			250
Temporary Equity, Carrying Amount, Attributable to Parent															$ 170,000			$ 170,000
Fifth Tranche Closing [Member] | Fifth Tranche Investor Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	156,026
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.6128
Proceeds from Issuance or Sale of Equity	$ 72,000
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)															$ 0.0001			$ 0.0001
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
Stock Issued During Period, Value, New Issues													$ 1,200,000
Series A Preferred Stock [Member] | Statera and Avenue Securities Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)												131
Series B Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)											8,400
Preferred Stock, Shares Issued (in shares)															2,075			2,075	2,155
Preferred Stock, Par or Stated Value Per Share (in dollars per share)															$ 0.0001			$ 0.0001
Stock Issued During Period, Value, New Issues																	0
Warrant, Down Round Feature, Increase (Decrease) in Equity, Amount															$ 0
Preferred Stock, Shares Outstanding (in shares)															2,075			2,075	2,155
Temporary Equity, Carrying Amount, Attributable to Parent															$ 1,421,000			$ 1,421,000	$ 1,379,000
Series B Preferred Stock [Member] | Preferred Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)							1,750			700
Equity Issuable, Maximum Number of Shares (in shares)											8,400
Proceeds from Issuance or Sale of Equity							$ 1,100			$ 398,000
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] | Fourth Tranche Closing [Member]
Stock Issued During Period, Shares, New Issues (in shares)						1,750
Series B Preferred Stock [Member] | Second Tranche Closing, Placement Agent Services [Member]
Proceeds from Issuance or Sale of Equity									$ 458,000
Series B Preferred Stock [Member] | Fourth Tranche Closing, Placement Agent Services [Member]
Proceeds from Issuance or Sale of Equity																$ 1,100,000
Series B Preferred Stock [Member] | Fifth Tranche Closing [Member]
Proceeds from Issuance or Sale of Equity	$ 169,000
Series C Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)				75,000
Preferred Stock, Shares Issued (in shares)															11,687			11,687	12,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)															$ 0.0001			$ 0.0001
Stock Issued During Period, Value, New Issues																	$ 0
Warrant, Down Round Feature, Increase (Decrease) in Equity, Amount															$ 0
Preferred Stock, Shares Outstanding (in shares)															11,687			11,687	12,000
Temporary Equity, Carrying Amount, Attributable to Parent															$ 6,218,000			$ 6,218,000	$ 5,991,000
Series C Preferred Stock [Member] | Preferred Purchase Agreement [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)				$ 1,000
Equity Issuable, Maximum Number of Shares (in shares)				75,000
Proceeds from Issuance or Sale of Equity			$ 5,900,000
Equity Issuable, Maximum Number of Shares, Tranche One (in shares)			12,000	12,000
Equity Issuable, Maximum Value of Shares, Tranche One			$ 12,000,000	$ 12,000,000
Equity Issuable, Maximum Number of Shares, Tranche Two (in shares)				6,000
Equity Issuable, Maximum Value of Shares, Tranche Two				$ 6,000,000
Equity Issuable, Maximum Number of Shares, Tranche Three (in shares)				57,000
Equity Issuable, Maximum Value of Shares, Tranche Three				$ 57,000,000
Equity Issuable, Maximum Aggregate Stated Value				$ 3,000,000
Equity Issuable, Minimum Shares Outstanding for First Refusal (in shares)				1,200