Note 4 - Common Stock (Details Textual) - USD ($)	Nov. 06, 2025	Nov. 05, 2025	Jul. 18, 2025	Mar. 31, 2026	Dec. 31, 2025
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 1	$ 1.21
Class of Warrant or Right, Outstanding (in shares)				27,751,022	16,868,306
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)				1	1
Registered Direct Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)		1,714,373	1,612,903
Shares Issued, Price Per Share (in dollars per share)		$ 0.6708	$ 0.93
Registered Direct Offering And Private Placement [Member]
Proceeds from Issuance or Sale of Equity, Gross		$ 1,150,000	$ 1,500,000
Sale of Stock, Ownership Limitation on Sale of Shares, Percent			19.90%
Proceeds from Issuance or Sale of Equity			$ 1,000,000
Registered Direct Offering And Private Placement [Member] | Placement Agent [Member]
Stock Issuance Cash Fee, Percentage of Gross Proceeds From Stock Issuance	6.00%
Stock Issuance, Reimbursing Expense Amount	$ 125,000
Private Placement [Member]
Proceeds from Issuance or Sale of Equity, Gross		$ 1,500,000
Private Placement [Member] | Unregistered Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)		2,236,136
Shares Issued, Price Per Share (in dollars per share)		$ 0.6708
Private Placement [Member] | Unregistered Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.6708	$ 1.2
Warrants and Rights Outstanding, Term (Year)		5 years	5 years
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		2,236,136
Private Placement [Member] | Unregistered Common Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.6708
Warrants and Rights Outstanding, Term (Year)		5 years
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		1,714,373
Class of Warrant or Right, Exercisable Commence Term (Month)		6 months