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Note 3 - Fair Value Measurements - Fair Value Valuation Assumptions (Details)		3 Months Ended		6 Months Ended
		Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)
Non-cash gain on changes in fair value of warrant liability		$ (0)	$ 80,000	$ (0)	$ (114,000)
Pre-amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member]
Total Value		$ 66,000,000		$ 66,000,000
Pre-amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Exercise Price [Member] | Minimum [Member]
Measurement Input		8.75		8.75
Measurement Input		8.75		8.75
Pre-amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Exercise Price [Member] | Maximum [Member]
Measurement Input		52.5		52.5
Measurement Input		52.5		52.5
Pre-amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Share Price [Member]
Measurement Input		2.51		2.51
Measurement Input		2.51		2.51
Pre-amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Option Volatility [Member]
Measurement Input		0.893		0.893
Measurement Input		0.893		0.893
Pre-amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member]
Measurement Input		0.0427		0.0427
Measurement Input		0.0427		0.0427
Pre-amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member]
Measurement Input		0.0508		0.0508
Measurement Input		0.0508		0.0508
Pre-amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Measurement Input		0		0
Measurement Input		0		0
Pre-amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Expected Term [Member] | Minimum [Member]
Measurement Input		1		1
Measurement Input		1		1
Pre-amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Expected Term [Member] | Maximum [Member]
Measurement Input		4.4		4.4
Measurement Input		4.4		4.4
Prior to Ratchet, March 24, 2024 [Member] | Series C Preferred Stock [Member]
Total Value	[1]	$ 500,000		$ 500,000
Prior to Ratchet, March 24, 2024 [Member] | Series C Preferred Stock [Member] | Measurement Input, Exercise Price [Member]
Measurement Input		8.75		8.75
Prior to Ratchet, March 24, 2024 [Member] | Series C Preferred Stock [Member] | Measurement Input, Share Price [Member]
Measurement Input		4.77		4.77
Prior to Ratchet, March 24, 2024 [Member] | Series C Preferred Stock [Member] | Measurement Input, Option Volatility [Member]
Measurement Input		0.799		0.799
Prior to Ratchet, March 24, 2024 [Member] | Series C Preferred Stock [Member] | Measurement Input, Risk Free Interest Rate [Member]
Measurement Input		0.0551		0.0551
Prior to Ratchet, March 24, 2024 [Member] | Series C Preferred Stock [Member] | Measurement Input, Expected Dividend Rate [Member]
Measurement Input		0		0
Prior to Ratchet, March 24, 2024 [Member] | Series C Preferred Stock [Member] | Measurement Input, Expected Term [Member]
Measurement Input		0.1		0.1
Issuance, March 25, 2024 [Member] | Unsecured Convertible Notes [Member]
Total value, embedded		$ 200,000		$ 200,000
Issuance, March 25, 2024 [Member] | Unsecured Convertible Notes [Member] | Measurement Input, Exercise Price [Member]
Measurement input, embedded derivative		4.9		4.9
Issuance, March 25, 2024 [Member] | Unsecured Convertible Notes [Member] | Measurement Input, Share Price [Member]
Measurement input, embedded derivative		4.51		4.51
Issuance, March 25, 2024 [Member] | Unsecured Convertible Notes [Member] | Measurement Input, Option Volatility [Member]
Measurement input, embedded derivative		0.869		0.869
Issuance, March 25, 2024 [Member] | Unsecured Convertible Notes [Member] | Measurement Input, Risk Free Interest Rate [Member]
Measurement input, embedded derivative		0.0454		0.0454
Issuance, March 25, 2024 [Member] | Unsecured Convertible Notes [Member] | Measurement Input, Expected Dividend Rate [Member]
Measurement input, embedded derivative		0		0
Issuance, March 25, 2024 [Member] | Unsecured Convertible Notes [Member] | Measurement Input, Expected Term [Member]
Measurement input, embedded derivative		2		2
Issuance, March 25, 2024 [Member] | March 2024 Warrant [Member]
Total Value		$ 100,000		$ 100,000
Issuance, March 25, 2024 [Member] | March 2024 Warrant [Member] | Measurement Input, Exercise Price [Member]
Measurement Input		4.9		4.9
Measurement Input		4.9		4.9
Issuance, March 25, 2024 [Member] | March 2024 Warrant [Member] | Measurement Input, Share Price [Member]
Measurement Input		4.55		4.55
Measurement Input		4.55		4.55
Issuance, March 25, 2024 [Member] | March 2024 Warrant [Member] | Measurement Input, Price Volatility [Member]
Measurement Input		0.869		0.869
Measurement Input		0.869		0.869
Issuance, March 25, 2024 [Member] | March 2024 Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member]
Measurement Input		0.0424		0.0424
Measurement Input		0.0424		0.0424
Issuance, March 25, 2024 [Member] | March 2024 Warrant [Member] | Measurement Input, Expected Dividend Rate [Member]
Measurement Input		0		0
Measurement Input		0		0
Issuance, March 25, 2024 [Member] | March 2024 Warrant [Member] | Measurement Input, Expected Term [Member]
Measurement Input		5.5		5.5
Measurement Input		5.5		5.5
Post amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member]
Total Value		$ 100,000,000		$ 100,000,000
Non-cash gain on changes in fair value of warrant liability				$ 70,000
Post amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Exercise Price [Member]
Measurement Input		2.5		2.5
Measurement Input		2.5		2.5
Post amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Share Price [Member]
Measurement Input		2.51		2.51
Measurement Input		2.51		2.51
Post amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Option Volatility [Member]
Measurement Input		0.893		0.893
Measurement Input		0.893		0.893
Post amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member]
Measurement Input		0.0427		0.0427
Measurement Input		0.0427		0.0427
Post amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member]
Measurement Input		0.0508		0.0508
Measurement Input		0.0508		0.0508
Post amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Measurement Input		0		0
Measurement Input		0		0
Post amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Expected Term [Member] | Minimum [Member]
Measurement Input		1		1
Measurement Input		1		1
Post amendment June 14, 2024 [Member] | September 2022, November 2022, and May 2023 Warrants [Member] | Measurement Input, Expected Term [Member] | Maximum [Member]
Measurement Input		4.4		4.4
Measurement Input		4.4		4.4
After Ratchet, March 24, 2024 [Member] | Series C Preferred Stock [Member]
Total Value	[1]	$ 900,000		$ 900,000
Deemed dividend				$ 400
After Ratchet, March 24, 2024 [Member] | Series C Preferred Stock [Member] | Measurement Input, Exercise Price [Member]
Measurement Input		4.9		4.9
After Ratchet, March 24, 2024 [Member] | Series C Preferred Stock [Member] | Measurement Input, Share Price [Member]
Measurement Input		4.77		4.77
After Ratchet, March 24, 2024 [Member] | Series C Preferred Stock [Member] | Measurement Input, Option Volatility [Member]
Measurement Input		0.799		0.799
After Ratchet, March 24, 2024 [Member] | Series C Preferred Stock [Member] | Measurement Input, Risk Free Interest Rate [Member]
Measurement Input		0.0551		0.0551
After Ratchet, March 24, 2024 [Member] | Series C Preferred Stock [Member] | Measurement Input, Expected Dividend Rate [Member]
Measurement Input		0		0
After Ratchet, March 24, 2024 [Member] | Series C Preferred Stock [Member] | Measurement Input, Expected Term [Member]
Measurement Input		0.1		0.1
Stockholder Approval May 28 2024 [Member] | Unsecured Convertible Notes [Member]
Total value, embedded		$ 200,000		$ 200,000
Gain, embedded derivative				$ (82,000)
Stockholder Approval May 28 2024 [Member] | Unsecured Convertible Notes [Member] | Measurement Input, Exercise Price [Member]
Measurement input, embedded derivative		4.9		4.9
Stockholder Approval May 28 2024 [Member] | Unsecured Convertible Notes [Member] | Measurement Input, Share Price [Member]
Measurement input, embedded derivative		4.94		4.94
Stockholder Approval May 28 2024 [Member] | Unsecured Convertible Notes [Member] | Measurement Input, Option Volatility [Member]
Measurement input, embedded derivative		0.839		0.839
Stockholder Approval May 28 2024 [Member] | Unsecured Convertible Notes [Member] | Measurement Input, Risk Free Interest Rate [Member]
Measurement input, embedded derivative		0.0494		0.0494
Stockholder Approval May 28 2024 [Member] | Unsecured Convertible Notes [Member] | Measurement Input, Expected Dividend Rate [Member]
Measurement input, embedded derivative		0		0
Stockholder Approval May 28 2024 [Member] | Unsecured Convertible Notes [Member] | Measurement Input, Expected Term [Member]
Measurement input, embedded derivative		1.8		1.8
Stockholder Approval May 28 2024 [Member] | March 2024 Warrant [Member]
Total Value		$ 100,000		$ 100,000
Non-cash gain on changes in fair value of warrant liability				$ (28,000)
Stockholder Approval May 28 2024 [Member] | March 2024 Warrant [Member] | Measurement Input, Exercise Price [Member]
Measurement Input		4.9		4.9
Measurement Input		4.9		4.9
Stockholder Approval May 28 2024 [Member] | March 2024 Warrant [Member] | Measurement Input, Share Price [Member]
Measurement Input		4.94		4.94
Measurement Input		4.94		4.94
Stockholder Approval May 28 2024 [Member] | March 2024 Warrant [Member] | Measurement Input, Price Volatility [Member]
Measurement Input		0.839		0.839
Measurement Input		0.839		0.839
Stockholder Approval May 28 2024 [Member] | March 2024 Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member]
Measurement Input		0.0456		0.0456
Measurement Input		0.0456		0.0456
Stockholder Approval May 28 2024 [Member] | March 2024 Warrant [Member] | Measurement Input, Expected Dividend Rate [Member]
Measurement Input		0		0
Measurement Input		0		0
Stockholder Approval May 28 2024 [Member] | March 2024 Warrant [Member] | Measurement Input, Expected Term [Member]
Measurement Input		5.3		5.3
Measurement Input		5.3		5.3
Stockholder Approval May 28 2024 [Member] | The December 2023 Warrants [Member]
Total Value		$ 200,000		$ 200,000
Non-cash gain on changes in fair value of warrant liability				$ (51,000)
Stockholder Approval May 28 2024 [Member] | The December 2023 Warrants [Member] | Measurement Input, Exercise Price [Member]
Measurement Input		8.75		8.75
Measurement Input		8.75		8.75
Stockholder Approval May 28 2024 [Member] | The December 2023 Warrants [Member] | Measurement Input, Share Price [Member]
Measurement Input		4.94		4.94
Measurement Input		4.94		4.94
Stockholder Approval May 28 2024 [Member] | The December 2023 Warrants [Member] | Measurement Input, Price Volatility [Member]
Measurement Input		0.839		0.839
Measurement Input		0.839		0.839
Stockholder Approval May 28 2024 [Member] | The December 2023 Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Measurement Input		0.0456		0.0456
Measurement Input		0.0456		0.0456
Stockholder Approval May 28 2024 [Member] | The December 2023 Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Measurement Input		0		0
Measurement Input		0		0
Stockholder Approval May 28 2024 [Member] | The December 2023 Warrants [Member] | Measurement Input, Expected Term [Member]
Measurement Input		5.1		5.1
Measurement Input		5.1		5.1
Reporting Date, December 31, 2023 [Member] | The December 2023 Warrants [Member]
Total Value		$ 300,000		$ 300,000
Reporting Date, December 31, 2023 [Member] | The December 2023 Warrants [Member] | Measurement Input, Exercise Price [Member]
Measurement Input		8.75		8.75
Measurement Input		8.75		8.75
Reporting Date, December 31, 2023 [Member] | The December 2023 Warrants [Member] | Measurement Input, Share Price [Member]
Measurement Input		7.14		7.14
Measurement Input		7.14		7.14
Reporting Date, December 31, 2023 [Member] | The December 2023 Warrants [Member] | Measurement Input, Price Volatility [Member]
Measurement Input		0.793		0.793
Measurement Input		0.793		0.793
Reporting Date, December 31, 2023 [Member] | The December 2023 Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Measurement Input		0.0385		0.0385
Measurement Input		0.0385		0.0385
Reporting Date, December 31, 2023 [Member] | The December 2023 Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Measurement Input		0		0
Measurement Input		0		0
Reporting Date, December 31, 2023 [Member] | The December 2023 Warrants [Member] | Measurement Input, Expected Term [Member]
Measurement Input		5.5		5.5
Measurement Input		5.5		5.5
[1] Includes value of incremental shares underlying preferred stock and adjusted for probability of occurrence.

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