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Note 7 - Stockholders' Equity (Details Textual)												9 Months Ended
	Sep. 19, 2025 USD ($) $ / shares shares	Jul. 08, 2025 USD ($)	Jun. 30, 2025 USD ($) shares	Apr. 22, 2025 USD ($) $ / shares shares	Dec. 02, 2024 USD ($)	Sep. 03, 2024 USD ($) $ / shares shares	Aug. 29, 2024 $ / shares shares	May 30, 2024 shares	Apr. 04, 2024 USD ($)	Feb. 09, 2024 USD ($) $ / shares shares	Dec. 06, 2023 USD ($)	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($)	Dec. 31, 2024 $ / shares shares	May 29, 2024 shares
Common Stock, Shares Authorized (in shares) | shares								50,000,000				50,000,000		50,000,000	100,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares												$ 1.88		$ 3.1
Payments of Stock Issuance Costs | $												$ 834,000	$ 1,228,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares												$ 0.001		$ 0.001
Warrants To Purchase Common Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares				406,818						67,104		274,696
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares				$ 1.905						$ 6.6		$ 1.95
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
September 2025 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares	4,800,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 1.25
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
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
April 2025 Financing [Member]
Stock Issued During Period, Shares, New Issues | shares				406,818
Proceeds from Issuance or Sale of Equity | $				$ 775,000
Payments of Stock Issuance Costs | $				$ 56,000
June 2025 Financing [Member]
Stock Issued During Period, Shares, New Issues | shares			274,696
Proceeds from Issuance or Sale of Equity | $			$ 570,000
Payments of Stock Issuance Costs | $			$ 9,000
September 2025 Financing [Member]
Stock Issued During Period, Shares, New Issues | shares	4,800,000
Proceeds from Issuance or Sale of Equity | $	$ 6,000,000
Payments of Stock Issuance Costs | $	$ 824,000
September 2025 Financing [Member] | Company Directors and Executive Officers [Member]
Stock Issued During Period, Shares, New Issues | shares	734,400
Proceeds from Issuance or Sale of Equity | $	$ 918,000
Sales Agreement With H.C. Wainwright & Co., LLC [Member]
Sale of Stock, Aggregate Value, Maximum | $		$ 3,600,000			$ 1,300,000				$ 1,800,000		$ 2,750,000
Accrued Sales Commission, Current, Percentage											3.00%
Sale of Stock, Available Value | $												$ 2,900,000
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio								15

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