Note 5 - Debt and Warrants Transactions (Details Textual) $ / shares in Units, shares in Thousands									1 Months Ended	2 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	May 26, 2026 USD ($) $ / shares shares	Mar. 04, 2026 USD ($) $ / shares shares	Feb. 03, 2026 USD ($) $ / shares shares	Nov. 05, 2025 USD ($) $ / shares shares	Oct. 02, 2025 USD ($)	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 17, 2025 USD ($)	Sep. 11, 2025 USD ($) $ / shares	Apr. 30, 2026 USD ($)	Mar. 04, 2026 USD ($) $ / shares shares	Sep. 30, 2026 USD ($) $ / shares	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2026 USD ($) $ / shares	Sep. 30, 2025 USD ($) $ / shares shares	Dec. 31, 2025 USD ($) $ / shares shares	Jun. 04, 2026 $ / shares shares	May 25, 2026 $ / shares shares	Sep. 29, 2025 USD ($) $ / shares shares	Jul. 31, 2025 $ / shares shares	Jul. 18, 2025 $ / shares	May 02, 2024 $ / shares	Apr. 03, 2023 $ / shares shares	Aug. 12, 2022 $ / shares shares	Aug. 11, 2022 USD ($)
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares											$ 4.78		$ 4.78		$ 5.92
Notes Issued													$ 1,889,000	$ 0
Warrant, Down Round Feature, Decrease in Net Income to Common Shareholder, Amount											$ (0)	$ 635,000	$ 86,000	$ 635,000
Registered Direct Offering And Private Placement [Member]
Shares Issued, Price Per Share (in dollars per share) | $ / shares				$ 3.35																$ 4.65
Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input				3.3		3.65						3.65		3.65
Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input				0.038		0.036						0.036		0.036
Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input				0.94		0.907						0.907		0.907
Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input				4.7		4.85						4.85		4.85
September 11, 2025 Warrants [Member]
Class of Warrant or Right, Issuance Price (in dollars per share) | $ / shares								$ 0.625
Warrants and Rights Outstanding, Term (Year)								5 years 6 months
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 3.35							$ 3.65								$ 3.35	$ 3.65	$ 3.65
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares	400															200	300
September 29, 2025 Warrant [Member]
Warrants and Rights Outstanding, Term (Year)																		5 years 6 months
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 3.35												$ 3.35	$ 3.7	$ 3.7
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares															300	100
Equity-classified Warrants [Member] | Measurement Input, Share Price [Member] | Minimum [Member]
Warrants and Rights Outstanding, Measurement Input																		3.6
Equity-classified Warrants [Member] | Measurement Input, Share Price [Member] | Maximum [Member]
Warrants and Rights Outstanding, Measurement Input																		3.65
Equity-classified Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member]
Warrants and Rights Outstanding, Measurement Input																		0.036
Equity-classified Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member]
Warrants and Rights Outstanding, Measurement Input																		0.037
Equity-classified Warrants [Member] | Measurement Input, Price Volatility [Member] | Minimum [Member]
Warrants and Rights Outstanding, Measurement Input																		0.8867
Equity-classified Warrants [Member] | Measurement Input, Price Volatility [Member] | Maximum [Member]
Warrants and Rights Outstanding, Measurement Input																		0.8981
Equity-classified Warrants [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input																		5.5
Warrants Issued With Convertible Notes [Member]
Warrants and Rights Outstanding, Term (Year)		5 years								5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 3.4								$ 3.4
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares		1,900								1,900
Warrants Issued With Convertible Notes [Member] | Measurement Input, Share Price [Member] | Minimum [Member]
Warrants and Rights Outstanding, Measurement Input		2.4								2.4
Warrants Issued With Convertible Notes [Member] | Measurement Input, Share Price [Member] | Maximum [Member]
Warrants and Rights Outstanding, Measurement Input		2.7								2.7
Warrants Issued With Convertible Notes [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input		0.037								0.037
Warrants Issued With Convertible Notes [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input		0.90								0.90
Warrants Issued With Convertible Notes [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input		5.5								5.5
Warrants Issued With Convertible Notes [Member] | Measurement Input, Effective Interest Method [Member]
Warrants and Rights Outstanding, Measurement Input		0.368								0.368
July 2025 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 3.35		$ 3.65						$ 3.65		$ 3.65				$ 3.65	$ 6
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares				600		500						500		500				500	300
Warrant, Down Round Feature, Decrease in Net Income to Common Shareholder, Amount				$ 100,000								$ 600,000
November 2025 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 3.35
September 2025 Warrants [Member]
Warrant, Down Round Feature, Decrease in Net Income to Common Shareholder, Amount	$ 100,000
September 2025 Warrants [Member] | Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input	3.96
September 2025 Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0.042
September 2025 Warrants [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	0.94
September 2025 Warrants [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input	4.85
Notes Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares																$ 2.81					$ 2.06	$ 26.8
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares																56						300
Warrants and Rights Outstanding																								$ 3,800,000
Notes Warrants [Member] | Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input											2.66		2.66		2.7
Notes Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input											0.044		0.044		0.035
Notes Warrants [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input											0.831		0.831		1.199
Notes Warrants [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input											0.86		0.86		1.61
Additional Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares																$ 106							$ 21.2
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares																28							100
Additional Warrants [Member] | Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input											2.66		2.66		2.7
Additional Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input											0.044		0.044		0.035
Additional Warrants [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input											0.813		0.813		1.16
Additional Warrants [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input											1.37		1.37		2.12
Smith [Member] | September 11, 2025 Warrants [Member]
Proceeds from Issuance of Warrants								$ 100,000
Huffmyer [Member] | September 11, 2025 Warrants [Member]
Proceeds from Issuance of Warrants							$ 15,000
The September 11, 2025 Notes [Member] | Smith [Member]
Debt Instrument, Maximum Borrowing Capacity								700,000
Proceeds from Issuance of Debt								700,000
Repayments of Debt									$ 200,000
Gain (Loss) on Extinguishment of Debt		$ 0
Extinguishment of Debt, Amount		$ 500,000
The September 11, 2025 Notes [Member] | Smith [Member] | Maximum [Member]
Repayments of Debt										$ 2,200,000
The September 11, 2025 Notes [Member] | Smith [Member] | September 11, 2025 Warrants [Member]
Proceeds from Issuance Notes and Warrants								800,000
The September 11, 2025 Notes [Member] | Huffmyer [Member]
Debt Instrument, Maximum Borrowing Capacity								$ 100,000
Debt Instrument, Interest Rate, Stated Percentage								15.00%
Proceeds from Issuance of Debt							85,000
The September 11, 2025 Notes [Member] | Huffmyer [Member] | September 11, 2025 Warrants [Member]
Proceeds from Issuance Notes and Warrants							$ 100,000
September 29, 2025 Note [Member]
Debt Instrument, Maximum Borrowing Capacity																		$ 400,000
Proceeds from Issuance of Debt					$ 100,000	$ 300,000
September 11th and 29th 2025 Notes [Member]
Proceeds from Issuance Notes and Warrants															$ 1,200,000
Debt Instrument, Unamortized Discount															$ 400,000
Secured Promissory Notes [Member] | Smith [Member]
Debt Instrument, Interest Rate, Stated Percentage			15.00%
Debt Instrument, Unamortized Discount			$ 400,000
Secured Promissory Notes [Member] | Smith [Member] | Unregistered Common Stock Warrants [Member]
Warrants and Rights Outstanding, Term (Year)			5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 3.4
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares			300
Proceeds from Issuance Notes and Warrants			$ 1,000,000
Proceeds from Issuance of Debt			800,000
Proceeds from Issuance of Warrants			$ 200,000
Secured Promissory Notes [Member] | Smith [Member] | Unregistered Common Stock Warrants [Member] | Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input			2.7
Secured Promissory Notes [Member] | Smith [Member] | Unregistered Common Stock Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input			0.038
Secured Promissory Notes [Member] | Smith [Member] | Unregistered Common Stock Warrants [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input			0.89
Secured Promissory Notes [Member] | Smith [Member] | Unregistered Common Stock Warrants [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input			5.5
Convertible Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		8.00%								8.00%
Debt Instrument, Unamortized Discount		$ 2,500,000								$ 2,500,000
Debt Instrument, Face Amount		$ 4,900,000								$ 4,900,000
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares		$ 3.4								$ 3.4
Debt Instrument, Default Interest Rate		12.00%								12.00%
Debt Instrument, Periodic Payment Per $1,000,000		$ 7,000
Notes Issued		1,900,000
Debt Instrument, Unamortized Discount (Premium), Net											$ 2,800,000		$ 2,800,000
Interest Expense, Debt											200,000		1,000,000
Amortization of Debt Issuance Costs and Discounts											$ 100,000		$ 600,000
Convertible Notes [Member] | Minimum [Member]
Debt Instrument, Periodic Payment		$ 1,000