Note 15 - Mezzanine Equity and Stockholders' Equity (Details Textual)										1 Months Ended				3 Months Ended					5 Months Ended	9 Months Ended		12 Months Ended
	Jul. 25, 2025 shares	Jul. 16, 2025 $ / shares shares	Jun. 11, 2025 shares	Apr. 29, 2025 USD ($) $ / shares shares	Jan. 24, 2025 $ / shares shares	Jul. 26, 2024 USD ($) $ / shares shares	Jul. 19, 2024 $ / shares shares	Jul. 18, 2024 USD ($) $ / shares shares	Apr. 03, 2024 USD ($) $ / shares shares	Jul. 31, 2025 USD ($) $ / shares shares	May 31, 2025 USD ($) $ / shares shares	Apr. 30, 2025 USD ($) $ / shares shares	Jul. 31, 2024 USD ($) $ / shares shares	Sep. 30, 2025 USD ($) $ / shares shares	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Sep. 30, 2024 USD ($) shares	Mar. 31, 2024 USD ($) shares	May 31, 2025 USD ($) $ / shares shares	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) $ / shares shares	Aug. 19, 2025 $ / shares	Jul. 01, 2025 $ / shares	May 30, 2025 $ / shares	Apr. 04, 2025 USD ($) $ / shares	Jun. 30, 2024 USD ($) $ / shares
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares														$ 0.001						$ 0.001		$ 0.001
Preferred Stock, Shares Authorized (in shares) | shares														4,970,680						4,970,680		4,970,680
Deemed Dividends, Preferred Stock																	$ (454,000)
Deemed Dividends, Warrants														$ (0)	$ 9,000		(0)			$ 9,000	$ (0)
Proceeds from Warrant Exercises																				353,000	0
Conversion of Stock, Amount Converted																	209,000
Gain (Loss) on Extinguishment of Debt														$ 0			71,000			52,000	14,591,000
Stock Issued During Period, Value, Conversion of Convertible Securities																	0	$ 280,000
Payments of Stock Issuance Costs																				$ (0)	68,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares														$ 0.001						$ 0.001		$ 0.001
Proceeds from Issuance of Common Stock																				$ 0	1,367,000
Dividends, Preferred Stock, Cash																	347,000
Stock Redeemed or Called During Period, Value																	772,000
Preferred Stock, Value, Issued														$ 0						$ 0		$ 0
ELOC Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares																				800,000
Agreement, Maximum Equity Value to be Issued																											$ 35
Proceeds from Issuance of Common Stock																				$ 2,400,000
Conversion of Series C Preferred Stock Into Common Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares														$ 1,000						$ 1,000
Conversion of Stock, Shares Converted (in shares) | shares														540						11,321
Conversion of Stock, Shares Issued (in shares) | shares										1,801,986	4,382,192			1,801,986						9,856,630
Conversion of Stock, Amount Converted																				$ 106,000
Adjustments to Additional Paid in Capital, Fair Value														$ 300,000						$ 8.7
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares														$ 0.001						$ 0.001
Gain (Loss) on Conversion of Stock														$ 0						$ 0
Conversion of Series D Preferred Stock into Common Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares														$ 1,000						$ 1,000
Conversion of Stock, Shares Converted (in shares) | shares																				256
Conversion of Stock, Shares Issued (in shares) | shares										689,442
Conversion of Stock, Amount Converted																				$ 689,442
Adjustments to Additional Paid in Capital, Fair Value																				$ 1,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares														$ 0.001						$ 0.001
Senior Secured Notes [Member]
Debt Instrument, Redeemable from Aggregate Gross Proceeds, Percent																										40.00%
April 2025 Convertible Senior Secured Notes [Member]
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares																										$ 1.1
Long-Term Debt, Gross																										$ 312,500
Senior Convertible Notes With First PIPE [Member]
Long-Term Debt, Gross													$ 1,200,000
Gain (Loss) on Extinguishment of Debt													(100,000)
Senior Convertible Notes With First PIPE [Member] | Embedded Derivative Financial Instruments [Member]
Derivative Liability													300,000
June and July Notes [Member]
Gain (Loss) on Extinguishment of Debt													0
July 2024 First Purchase Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares								68,813
Proceeds from Issuance of Private Placement								$ 12,900,000
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares																							$ 0.3
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares								$ 205.5
Noncash Proceeds from Issuance of Private Placement								$ 9,500,000
July 2024 First Purchase Agreement [Member] | First Private Placement to June and July Notes [Member]
Class of Warrant or Right, Exchanged During Period													4,125
July 2024 First Purchase Agreement [Member] | First Private Placement to Series B [Member]
Class of Warrant or Right, Exchanged During Period													437,614
First PIPE [Member] | Chief Executive Officer [Member]
Proceeds from Issuance or Sale of Equity								15,000
First PIPE [Member] | Chief Managerial Officer [Member]
Proceeds from Issuance or Sale of Equity								$ 10,000
July 2024 Second Purchase Agreement [Member]
Proceeds from Issuance of Private Placement						$ 1,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares						$ 5,348
First and Second Private Placement [Member]
Payments of Stock Issuance Costs													1,200,000
First and Second Private Placement [Member] | July 2024 First Purchase Agreement Placement Agent [Member]
Payments of Stock Issuance Costs													$ 200,000
ELOC Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares														21,100,000
Stock Issuance Agreement, Shares Authorized (in shares) | shares										555,555,556
Proceeds from Issuance or Sale of Equity																				$ 15,849,000	4,371,000
Agreement, Maximum Equity Value to be Issued										$ 500,000,000																	$ 35,000,000
Debt Instrument, Convertible, Number of Equity Instruments										166,687,215
Proceeds from Issuance of Common Stock														$ 13,400,000
Stock Issued During Period, Value, New Issues, Percentage of Total Proceeds																				30.00%
ATM Program [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares																		2,862
Proceeds from Issuance of Common Stock																		$ 1,400,000
Treasury Strategy Warrant Shares [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares		66,000,000
July 2024 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares												$ 1.1	$ 205.5														$ 1.9714
Deemed Dividends, Warrants												$ 400,000
Warrants and Rights, Exercised During Period (in shares) | shares														72,618						151,266
Proceeds from Warrant Exercises																				$ 400,000
Warrants and Rights Outstanding													$ 10,800,000									300,000
July 2024 Warrants [Member] | First and Second Private Placement [Member]
Payments of Stock Issuance Costs													$ 1,100,000
July 2024 First Purchase Agreement Warrants [Member]
Class of Warrant or Right, Issued During Period (in shares) | shares													18,182
Proceeds from (Repurchase of) Equity													$ 3,400,000
Warrants and Rights Outstanding																	$ 2,600,000				2,600,000
July 2024 First Purchase Agreement Warrants [Member] | Chief Managerial Officer [Member]
Class of Warrant or Right, Issued During Period (in shares) | shares								53
July 2024 Second Purchase Agreement Warrants [Member]
Proceeds from Issuance of Warrants													700,000
July 2024 Second Purchase Agreement Warrants [Member] | Placement Agent Fees and Expenses [Member]
Class of Warrant or Right, Issued During Period (in shares) | shares						160
July 2024 First Purchase Agreement [Member] | First Private Placement to Senior Convertible Notes [Member]
Class of Warrant or Right, Exchanged During Period													$ 8,891
Series E Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares		60,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares		$ 0.001
Preferred Stock, Stated Value Per Share (in dollars per share) | $ / shares		$ 1,000
Series D Preferred Stock, Mezzanine Equity [Member]
Preferred Stock, Stated Value Per Share (in dollars per share) | $ / shares												$ 1,000
Proceeds from Issuance of Private Placement																				2,813,000	0
Preferred Stock, Shares Authorized (in shares) | shares												5,000
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares												$ 1.368												$ 0.3
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | shares												731
Preferred Stock, Dividend Rate, Percentage				10.00%
Preferred Stock Dividend Rate Triggering Event Percentage				18.00%
Deemed Dividends, Preferred Stock										$ 1,000,000				$ (171,000)	74,000
Stock Issued During Period, Value, Conversion of Convertible Securities														298,000
Stock Redeemed or Called During Period, Value														1,410,000
Series D Preferred Stock, Mezzanine Equity [Member] | Minimum [Member]
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares												$ 0.274
Series D Preferred Stock, Mezzanine Equity [Member] | Securities Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares				3,125															563
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.001
Proceeds from Issuance of Private Placement				$ 2,500,000															$ 450,000
Series C Preferred Stock Mezzanine Equity [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.001
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares										$ 0.3	$ 0.45								$ 0.45						$ 1.1
Conversion of Stock, Shares Converted (in shares) | shares	540
Deemed Dividends, Preferred Stock										$ 300,000	$ 1,700,000			(647,000)	4,084,000	$ 782,000
Stock Issued During Period, Value, Conversion of Convertible Securities														980,000	$ 4,823,000	2,863,000
Stock Redeemed or Called During Period, Value														15,000		$ 373,000
Series C Preferred Stock Mezzanine Equity [Member] | Stock Holder One [Member]
Conversion of Stock, Shares Converted (in shares) | shares			710
Conversion of Stock, Percent of Shares Converted			65.00%
Series C Preferred Stock Mezzanine Equity [Member] | Stock Holder Two [Member]
Conversion of Stock, Shares Converted (in shares) | shares			1,262
Conversion of Stock, Percent of Shares Converted			100.00%
Series C Preferred Stock Mezzanine Equity [Member] | Minimum [Member]
Conversion of Stock, Percent of Position to Convert											30.00%								30.00%
Series C Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares					$ 0.001		$ 1,000						$ 1,000
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares					$ 8.04		$ 187																$ 0.3
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | shares							5
Preferred Stock, Dividend Rate, Percentage							10.00%
Preferred Stock Dividend Rate Triggering Event Percentage							18.00%
Deemed Dividends, Preferred Stock														$ 1,700,000						5,513,000	0
Stock Issuance Agreement, Shares Authorized (in shares) | shares							18,820
Conversion of Stock, Amount Converted																				$ 8,667,000	$ 0
Series C Preferred Stock [Member] | Chief Executive Officer [Member]
Class of Warrant or Right, Issued During Period (in shares) | shares								80
Series C Preferred Stock [Member] | Conversion of Series C Preferred Stock Into Common Stock [Member]
Conversion of Stock, Shares Converted (in shares) | shares					1,895
Conversion of Stock, Shares Issued (in shares) | shares					235,846
Series C Preferred Stock [Member] | Minimum [Member]
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares								$ 64
Series C Preferred Stock [Member] | July 2024 First Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares								16,099									4,255
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares								$ 0.001
Series C Preferred Stock [Member] | July 2024 First Purchase Agreement [Member] | July 2024 First Purchase Agreement Placement Agent [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares								161
Class of Warrant or Right, Issued During Period (in shares) | shares								1,258
Series C Preferred Stock [Member] | July 2024 First Purchase Agreement [Member] | First Private Placement to June and July Notes [Member]
Conversion of Stock, Shares Issued (in shares) | shares													966
Conversion of Stock, Amount Issued													$ 800,000
Conversion of Stock, Amount Converted													$ 1,600,000
Series C Preferred Stock [Member] | July 2024 First Purchase Agreement [Member] | First Private Placement to Senior Convertible Notes [Member]
Conversion of Stock, Shares Issued (in shares) | shares													2,080
Series C Preferred Stock [Member] | July 2024 First Purchase Agreement [Member] | First Private Placement to Series B [Member]
Conversion of Stock, Shares Issued (in shares) | shares													8,798
Series C Preferred Stock [Member] | First PIPE [Member] | Chief Executive Officer [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares								19
Series C Preferred Stock [Member] | First PIPE [Member] | Chief Managerial Officer [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares								13
Series C Preferred Stock [Member] | July 2024 Second Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares						1,250							1,250
Proceeds from Issuance of Preferred Stock and Preference Stock													$ 300,000
Series C Preferred Stock [Member] | July 2024 Second Purchase Agreement [Member] | Placement Agent Fees and Expenses [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares						30
Series C Preferred Stock [Member] | July 2024 Second Purchase Agreement [Member] | First Private Placement to June and July Notes [Member]
Conversion of Stock, Amount Issued													0.8
Series C Preferred Stock [Member] | First and Second Private Placement [Member]
Payments of Stock Issuance Costs													$ 1,400,000
Series C Preferred Stock [Member] | First and Second Private Placement [Member] | First and Second Purchase Agreement Placement Agent [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares													191
Class of Warrant or Right, Issued During Period (in shares) | shares													1,418
Payments of Stock Issuance Costs													$ 300,000
Series C Preferred Stock [Member] | ELOC Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares																				402
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares														$ 1,000						$ 1,000
Preferred Stock, Redemption Premium, Percentage														20.00%						20.00%
Stock Redeemed or Called During Period, Value, Net																				$ 600,000
Dividends, Preferred Stock, Cash																				100,000
Stock Redeemed or Called During Period, Value																				$ 0.5
July 2024 Second Purchase Agreement Warrants [Member]
Class of Warrant or Right, Issued During Period (in shares) | shares													5,348
Proceeds from Issuance or Sale of Equity, Gross													$ 1,000,000
Series B Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares									$ 1,000
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares									$ 324.27
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | shares									3
Preferred Stock, Dividend Rate, Percentage									10.00%
Stock Issuance Agreement, Shares Authorized (in shares) | shares									5,500
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares) | shares													5,500
Stock Issued During Period, Value, Conversion of Convertible Securities													$ 6,900,000									6,900,000
Adjustments to Additional Paid in Capital, Fair Value																						$ 7,000,000
Payments of Stock Issuance Costs									$ 68,000
Preferred Stock, Value, Issued									7,000,000
Stock Issuance Agreement, Amount Authorized									$ 5,500,000
Series B Preferred Stock [Member] | Minimum [Member]
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares									$ 64.89