Note 5 - Equity Transactions (Details Textual)										12 Months Ended
	Nov. 06, 2025 USD ($)	Nov. 05, 2025 USD ($) $ / shares shares	Jul. 18, 2025 USD ($) $ / shares shares	Nov. 08, 2024 USD ($)	Oct. 03, 2024 USD ($) $ / shares shares	Jul. 11, 2024 USD ($)	May 10, 2024 $ / shares shares	Apr. 03, 2024	Dec. 27, 2023	Dec. 31, 2025 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Sep. 29, 2024 $ / shares shares	May 14, 2024 $ / shares shares
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares										$ 1.21	$ 1.41
Proceeds from Issuance or Sale of Equity | $										$ 3,352,000	$ 9,839,000
Class of Warrant or Right, Outstanding (in shares)										16,868,306	8,382,048
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)										1	1
Pre-Funded Warrants [Member]
Class Of Warrant Or Right, Exercised In Period (in shares)											845,000
Stock Issued During Period, Shares, Exercise of Warrants (in shares)										844,061
Roth Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)												20,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares												$ 1.46
Securities Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)							1,065,000
Shares Issued, Price Per Share (in dollars per share) | $ / shares							$ 2.15
Proceeds from Issuance or Sale of Equity | $						$ 3,400,000
Securities Purchase Agreement [Member] | Pre-Funded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							845,000
Class of Warrant or Right, Purchase Price of Warrants (in dollars per share) | $ / shares							$ 2.149
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares							$ 0.001
Securities Purchase Agreement [Member] | Unregistered Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)													1,910,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares													$ 2.34
Securities Purchase Agreement [Member] | Roth Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)													133,700
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares													$ 2.86
Percent of Aggregate Share and Warrants													7.00%
Registered Direct Offering And Private Placement [Member]
Proceeds from Issuance or Sale of Equity | $			$ 1,000,000	$ 6,600,000
Proceeds from Issuance or Sale of Equity, Gross | $		$ 1,150,000	$ 1,500,000		$ 6,900,000
Sale of Stock, Ownership Limitation on Sale of Shares, Percent			19.90%
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
October 2024 Registered Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)					3,321,881
Proceeds from Issuance or Sale of Equity, Gross | $					$ 3,900,000
October 2024 Registered Offering [Member] | Related Party [Member]
Proceeds from Issuance or Sale of Equity, Gross | $					$ 200,000
October 2024 Private Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)					2,575,107
Proceeds from Issuance or Sale of Equity, Gross | $					$ 3,000,000
October 2024 Offerings [Member]
Shares Issued, Price Per Share (in dollars per share) | $ / shares					$ 1.165
October 2024 Offerings [Member] | Unregistered Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares					$ 1.04
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) | $ / shares		$ 0.6708	$ 0.93
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) | $ / shares		$ 0.6708
Private Placement [Member] | Unregistered Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		2,236,136
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 0.6708	$ 1.2
Warrants and Rights Outstanding, Term (Year)		5 years	5 years
Private Placement [Member] | Unregistered Common Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		1,714,373
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 0.6708
Warrants and Rights Outstanding, Term (Year)		5 years
Class of Warrant or Right, Exercisable Commence Term (Month)		6 months
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio								8	8