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Note 7 - Stockholders' Equity (Details Textual)						3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 03, 2024 USD ($) $ / shares shares	Aug. 29, 2024 $ / shares shares	May 30, 2024	Feb. 09, 2024 USD ($) $ / shares shares	Apr. 12, 2022 USD ($)	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) shares	Jun. 30, 2023 USD ($) shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 06, 2023
Common Stock, Shares Authorized (in shares) | shares						50,000,000			50,000,000		100,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares						$ 0.001			$ 0.001		$ 0.001
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares						$ 3.1			$ 3.1		$ 94.5
Payments of Stock Issuance Costs | $									$ 1,228,000	$ 435,000
Proceeds from Issuance of Common Stock | $									$ 10,513,000	$ 3,042,000
Common Warrants With Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares		1,377,990				2,400,000			2,400,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 3	$ 3
Common Warrants With Stock [Member] | Company Directors and Executive Officers [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares		211,000
Common Warrants Issued With Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares		1,022,010
Prefunded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares		1,022,010
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 2.999
Warrants To Purchase Common Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares				67,104
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares				$ 6.6
Common Stock In 2024 Agreement [Member]
Stock Issued During Period, Shares, New Issues | shares		1,377,990
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares		$ 0.001
Common Warrants With Stock [Member]
Stock Issued During Period, Shares, New Issues | shares	2,400,000
September 2024 Financing [Member]
Proceeds from Issuance or Sale of Equity | $	$ 7,200,000
Payments of Stock Issuance Costs | $	$ 926,000
September 2024 Financing [Member] | Company Directors and Executive Officers [Member]
Stock Issued During Period, Shares, New Issues | shares									211,000
February 2024 Financing [Member]
Stock Issued During Period, Shares, New Issues | shares				134,199
Proceeds from Issuance or Sale of Equity | $				$ 875,000
Payments of Stock Issuance Costs | $				$ 43,000
Sales Agreement with Cantor Fitzgerald Co (Cantor) [Member]
Stock Issued During Period, Shares, New Issues | shares						0	2,219	11,209	412,239
Payments of Stock Issuance Costs | $						$ 0	$ 48,000	$ 90,000	$ 103,000
Sale of Stock, Aggregate Value, Maximum | $					$ 10,500,000
Accrued Sales Commission, Current, Percentage					3.00%
Proceeds from Issuance of Common Stock | $						0	$ 93,000	$ 395,000	2,400,000
Sales Agreement With H.C. Wainwright & Co., LLC [Member]
Sale of Stock, Aggregate Value, Maximum | $											$ 2,750,000
Accrued Sales Commission, Current, Percentage												3.00%
Sale of Stock, Available Value | $						$ 264,000			$ 264,000
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio			15

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