Note 4 - Common Stock (Details Textual) - USD ($)						3 Months Ended	6 Months Ended
	Jun. 30, 2025	Nov. 08, 2024	Oct. 03, 2024	Jul. 11, 2024	May 10, 2024	Sep. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 29, 2024	May 14, 2024
Proceeds from Issuance or Sale of Equity							$ 0	$ 3,351,000
Pre-Funded Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.001						$ 0.001
Class Of Warrant Or Right, Exercised In Period (in shares)						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				$ 3,400,000
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)					$ 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		$ 6.6	$ 6,900,000
October 2024 Registered Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)			3,321,881
Proceeds from Issuance or Sale of Equity			$ 3,900,000
October 2024 Registered Offering [Member] | Related Party [Member]
Proceeds from Issuance or Sale of Equity			$ 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			$ 3,000,000
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