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Note 8 - Stockholders' Equity (Details Textual)										12 Months Ended
	Dec. 02, 2024 USD ($)	Sep. 03, 2024 USD ($) $ / shares shares	Aug. 29, 2024 $ / shares shares	May 30, 2024	Feb. 09, 2024 USD ($) $ / shares shares	Dec. 06, 2023 USD ($)	Nov. 16, 2023 USD ($) $ / shares shares	Jun. 21, 2023 USD ($) $ / shares shares	Apr. 12, 2022 USD ($)	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Sep. 30, 2024 USD ($)	Dec. 31, 2022 $ / shares
Common Stock, Shares Authorized (in shares) | shares										50,000,000	100,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares										$ 0.001	$ 0.001
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares										$ 3.1	$ 94.5		$ 95.4
Payments of Stock Issuance Costs										$ 1,252,000	$ 662,000
Proceeds from Issuance of Common Stock										$ 10,552,000	$ 4,388,000
Common Warrants With Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares		2,400,000	1,377,990
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 3	$ 3
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
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
Common Warrants With Stock [Member]
Stock Issued During Period, Shares, New Issues | shares		2,400,000
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
November 2023 Financing [Member]
Stock Issued During Period, Shares, New Issues | shares							133,333
Payments of Stock Issuance Costs							$ 312,000
Shares Issued, Price Per Share (in dollars per share) | $ / shares							$ 9.75
Proceeds from Issuance of Common Stock							$ 1,300,000
June 2023 Financing [Member]
Stock Issued During Period, Shares, New Issues | shares								75,543
Payments of Stock Issuance Costs								$ 194,000
Shares Issued, Price Per Share (in dollars per share) | $ / shares								$ 35.04
Proceeds from Issuance of Common Stock								$ 2,600,000
June 2023 Financing [Member] | Company’s Directors and Executive Officers [Member]
Stock Issued During Period, Shares, New Issues | shares								13,556
Sales Agreement with Cantor Fitzgerald Co (Cantor) [Member]
Stock Issued During Period, Shares, New Issues | shares										428,864	14,349
Payments of Stock Issuance Costs										$ 94,000	$ 179,000
Proceeds from Issuance of Common Stock										2,500,000	$ 441,000
Sale of Stock, Aggregate Value, Maximum									$ 10,500,000
Accrued Sales Commission, Current, Percentage									3.00%
Sales Agreement With H.C. Wainwright & Co., LLC [Member]
Sale of Stock, Aggregate Value, Maximum	$ 1,300,000					$ 2,750,000
Accrued Sales Commission, Current, Percentage						3.00%
Sale of Stock, Available Value										$ 1,300,000		$ 264,000
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio				15

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