Note 3 - Sale of Stock for Cash (Details Textual) - USD ($)	11 Months Ended	12 Months Ended
	Dec. 13, 2022	Dec. 31, 2023	Dec. 31, 2022
Stock Issued During Period, Value, Commitment Fee			$ 0
Proceeds from Issuance of Common Stock		$ 2,153,000	$ 3,617,000
Warrants Issued with 2020 Unit Offering [Member] | Minimum [Member]
Warrants and Rights Outstanding, Term (Month)		6 months
Warrants Issued with 2020 Unit Offering [Member] | Maximum [Member]
Warrants and Rights Outstanding, Term (Month)		5 years
The 2020 Unit Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)		8,170,287	13,568,524
Proceeds from Issuance of Common Stock		$ 1,158,000	$ 2,364,000
Lincoln Park Capital Fund, LLC [Member]
Stock Purchase Agreement, Maximum Amount of Common Stock	$ 10,000,000
Stock Issued During Period, Shares, Commitment Fee (in shares)	1,250,000
Stock Issued During Period, Value, Commitment Fee	$ 240,000
Stock Issued During Period, Shares, New Issues (in shares)		3,833,230	6,011,701
Proceeds from Issuance of Common Stock		$ 995,000	$ 1,253,000