Note 4 - Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands							3 Months Ended	9 Months Ended
	Jul. 18, 2025	Jun. 30, 2025	Nov. 08, 2024	Oct. 03, 2024	Jul. 11, 2024	May 10, 2024	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Sep. 29, 2024	May 14, 2024
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 1.41		$ 1.74
Proceeds from Issuance or Sale of Equity								$ 966	$ 3,351
Class of Warrant or Right, Outstanding (in shares)								12,546,330		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, Exercise Price of Warrants or Rights (in dollars per share)								$ 0.001
Class Of Warrant Or Right, Exercised In Period (in shares)							845,000		845,000
Stock Issued During Period, Shares, Exercise of Warrants (in shares)		845,000					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)											$ 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)						$ 2.15
Proceeds from Issuance or Sale of Equity					$ 3,400
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)						$ 2.149
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 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)												$ 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)												$ 2.86
Percent of Aggregate Share and Warrants												7.00%
Registered Direct Offering And Private Placement [Member]
Proceeds from Issuance or Sale of Equity	$ 1,500		$ 6,600	$ 6,900
Sale of Stock, Ownership Limitation on Sale of Shares, Percent	19.90%
Sale of Stock, Service Fee, Percentage of Gross Proceeds	1.00%
October 2024 Registered Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)				3,321,881
Proceeds from Issuance or Sale of Equity				$ 3,900
October 2024 Registered Offering [Member] | Related Party [Member]
Proceeds from Issuance or Sale of Equity				$ 200
October 2024 Private Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)				2,575,107
Proceeds from Issuance or Sale of Equity				$ 3,000
October 2024 Offerings [Member]
Shares Issued, Price Per Share (in dollars per share)				$ 1.165
October 2024 Offerings [Member] | Unregistered Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 1.04
Registered Direct Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)	1,612,903
Shares Issued, Price Per Share (in dollars per share)	$ 0.93
Private Placement [Member] | Unregistered Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 1.2
Warrants and Rights Outstanding, Term (Year)	5 years