Note 8 - Convertible Notes Payable (Details Textual) $ / shares in Units, shares in Millions					1 Months Ended			3 Months Ended		9 Months Ended
	Aug. 26, 2025 USD ($)	Aug. 19, 2025 USD ($)	Jul. 02, 2025 USD ($) $ / shares	Jun. 05, 2025 USD ($)	Jul. 31, 2025 USD ($) $ / shares shares	Jun. 27, 2025 USD ($) $ / shares	Jun. 27, 2025 USD ($) $ / shares	Sep. 30, 2025 USD ($) $ / shares	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) $ / shares	Sep. 30, 2024 USD ($)	Jun. 02, 2025 USD ($)	Dec. 31, 2024 $ / shares
Proceeds from Notes Payable										$ 500,000	$ 0
Fair Value Adjustment of Convertible Notes Payable								$ 2,684,000	$ 0	3,473,000	0
Gain (Loss) on Issuance of Debt								$ (14,965,000)	$ 0	$ (22,402,000)	$ 0
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares								$ 0.001		$ 0.001			$ 0.001
Conversion of June 5 and June 9 Notes Into Common Stock [Member]
Debt Conversion, Original Debt, Amount					$ 400,000
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares					0.7
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares					$ 0.001
June 2025 Notes [Member]
Debt Instrument, Face Amount						$ 1,300,000	$ 1,300,000
Proceeds From Convertible Debt and Warrants							$ 1,100,000
June 5 Note and June 2025 Notes [Member]
Debt Instrument, Trading Days to Repay Debt Upon Sale of Securities						10	10
Note Warrants [Member]
Class of Warrant or Right, Issued, Percentage of Purchase Price			25.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 0.587
Note Warrants [Member] | One June Purchaser [Member]
Class of Warrant or Right, Value of Securities Called by Warrants or Rights			$ 20,833
Note Warrants [Member] | Other June Purchasers [Member]
Class of Warrant or Right, Value of Securities Called by Warrants or Rights			12,500
Note Warrants [Member] | Both July Purchasers [Member]
Class of Warrant or Right, Value of Securities Called by Warrants or Rights			8,750
June 2025 Warrants [Member]
Class of Warrant or Right, Value of Securities Called by Warrants or Rights						$ 3,500,000	$ 3,500,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares						$ 0.587	$ 0.587
Warrants and Rights Outstanding, Term (Year)						5 years	5 years
Class of Warrant or Right, Maximum Beneficial Ownership Percentage						4.99%	4.99%
Class of Warrant or Right, Maximum Beneficial Ownership Percentage, With Written Notice						9.99%	9.99%
Class of Warrant or Right, Maximum Beneficial Ownership Percentage, Period of Written Notice (Day)						61 days
Warrants and Rights Outstanding												$ 2,900,000
July Notes [Member]
Debt Instrument, Face Amount			40,698
Proceeds from Notes Payable			$ 35,000
June and July Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage			14.00%
Debt Instrument, Term (Month)			12 months
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares			$ 0.587
Proceeds From Convertible Debt and Warrants			$ 253,333
June 5 Note Purchase Agreement [Member]
Debt Instrument, Interest Rate, Stated Percentage				14.00%
Debt Instrument, Period Before Holder can Elect Payment (Month)				6 months
Debt Instrument Interest Rate Default Percentage				24.00%
June 5 Note and June 2025 Notes [Member]
Debt Instrument, Term (Month)						1 year
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares					$ 0.3			$ 0.587		$ 0.587
Debt Instrument, Convertible, Maximum Beneficial Ownership Percentage				4.99%
Debt Instrument, Convertible, Maximum Beneficial Ownership Interest, With Written Notice				9.99%
Debt Instrument, Convertible, Maximum Beneficial Ownership Percentage, Period of Written Notice (Day)				61 days
June 2025 Notes [Member]
Notes Payable, Fair Value Disclosure								$ 2,600,000		$ 2,600,000		$ 8,600,000
Fair Value Adjustment of Convertible Notes Payable								2,700,000		3,500,000
Gain (Loss) on Issuance of Debt								$ (7,300,000)		$ (7,300,000)
June Purchase Agreements [Member]
Debt Instrument, Face Amount				$ 3,600,000
Proceeds from Notes Payable				$ 3,100,000
Repayments of Debt	$ 2,200,000
June 5, 2025 Senior Unsecured Convertible Promissory Note Issued to DFU, LLC [Member]
Debt Instrument, Face Amount		$ 3,600,000
June 9, 2025 Senior Unsecured Convertible Notes Issued to Each of Keystone Capital Partners, Llc and Seven Knots,Llc [Member]
Debt Instrument, Face Amount		232,550
June 9, 2025 Senior Unsecured Convertible Notes Issued to C/M Capital Master Fund Lp [Member]
Debt Instrument, Face Amount		116,280
June 9, 2025 senior unsecured convertible notes issued to WVP Emerging Manager Onshore Fund [Member]
Debt Instrument, Face Amount		348,837
June 24, 2025 Senior Unsecured Convertible Promissory Note Issued to Certain Purchasers [Member]
Proceeds from Issuance of Debt		100,000
June 27, 2025 Convertible Promissory Notes to Purchasers [Member]
Debt Instrument, Face Amount		58,140
Proceeds from Issuance of Debt		50,000
Other June Purchaser Convertible Promissory Note [Member]
Debt Instrument, Face Amount		96,899
Proceeds from Issuance of Debt		83,333
July 2, 2025 Convertible Promissory Notes to the July Purchasers [Member]
Debt Instrument, Face Amount		40,698
Proceeds from Issuance of Debt		35,000
July 23, 2025 Convertible Promissory Note Issued to Seven Knot [Member]
Debt Instrument, Face Amount		$ 10,000,000