Note 3 - Sale of Stock for Cash (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 13, 2022
Proceeds from Issuance of Common Stock				$ 349,000
The Six Month Warrants Issued in Unit Offerings [Member]
Warrants and Rights Outstanding, Term (Month)		6 months		6 months	6 months	6 months
The Five Year Warrants Issued in Unit Offerings [Member]
Warrants and Rights Outstanding, Term (Month)		5 years		5 years	5 years	5 years
Unit Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)	0	0	0	1,848,720
Proceeds From Issuance of Common Stock, Gross				$ 419,000
Lincoln Park Capital Fund, LLC [Member]
Stock Purchase Agreement, Maximum Amount of Common Stock							$ 10,000,000
Stock Issued During Period, Shares, New Issues (in shares)	4,222,467	0	8,299,752	766,175
Proceeds from Issuance of Common Stock	$ 764,000		$ 1,587,000	$ 260,000