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Note 7 - Stockholders' Equity (Details Textual)				3 Months Ended		6 Months Ended		12 Months Ended
	May 30, 2024	Feb. 09, 2024 USD ($) $ / shares shares	Apr. 12, 2022 USD ($)	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) shares	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 06, 2023
Common Stock, Shares Authorized (in shares) | shares				50,000,000		50,000,000		100,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares				$ 66.3		$ 66.3		$ 94.5
Payments of Stock Issuance Costs						$ 152,000	$ 285,000
Proceeds from Issuance of Common Stock						$ 3,315,000	$ 2,950,000
February 2024 Financing [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares		134,199
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
Proceeds from Issuance of Common Stock		$ 875,000
Payments of Stock Issuance Costs		$ 43,000
Sales Agreement with Cantor Fitzgerald Co (Cantor) [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares				335,112	1,907	412,239	8,990
Payments of Stock Issuance Costs				$ 71,000	$ 29,000	$ 103,000	$ 42,000
Sale of Stock, Aggregate Value, Maximum			$ 10,500,000
Accrued Sales Commission, Current, Percentage			3.00%
Proceeds from Issuance of Common Stock				1,800,000	$ 58,000	2,400,000	$ 302,000
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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