Note 7 - Stockholders' Equity (Details Textual) - USD ($)			3 Months Ended		12 Months Ended
	Feb. 09, 2024	Apr. 12, 2022	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 06, 2023	Sep. 30, 2023	Dec. 31, 2022
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 4.42	$ 6.3
Payments of Stock Issuance Costs			$ 90,000	$ 180,000
Proceeds from Issuance of Common Stock			$ 1,466,000	$ 244,000
February 2024 Financing [Member]
Stock Issued During Period, Shares, New Issues (in shares)	2,012,978
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	1,006,488
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.4423
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)			1,156,877	106,241
Payments of Stock Issuance Costs			$ 32,000	$ 13,000
Sale of Stock, Aggregate Value, Maximum		$ 10,500,000
Accrued Sales Commission, Current, Percentage		3.00%
Proceeds from Issuance of Common Stock			$ 591,000	$ 244,000
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%