Note 7 - Stockholders' Equity (Details Textual) - USD ($)		3 Months Ended
	Mar. 15, 2023	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Nov. 22, 2023	Sep. 30, 2023
Sale of common stock and warrants, net (in shares)	125,000
Common Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001		$ 0.001
Class of Warrant or Right, Outstanding		1,238,869		1,238,869
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 3.14		$ 3.14
Warrants and Rights Outstanding, Term		4 years 3 months 25 days		4 years 6 months 25 days
Proceeds from Issuance or Sale of Equity	$ 2,600,000,000,000
Payments of Stock Issuance Costs	$ 360,000,000
Proceeds from Warrant Exercises		$ 0	$ 421,000
Proceeds from Issuance of Common Stock, Net		$ 99,000	$ 2,640,000
Warrant Amendment Agreement [Member]
Sale of common stock and warrants, net (in shares)	158,731
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 6.3					$ 2.65
Warrants Exercised			158,731
Proceeds from Warrant Exercises			$ 421,000
At The Market Offering Agreement [Member]
Sale of common stock and warrants, net (in shares)		221,736
Common Stock, Par or Stated Value Per Share					$ 0.001
Maximum Offering Price for Issuance of Common Stock					$ 1,288,000
Shares Issued, Average Price Per Share		$ 0.45
Proceeds from Issuance of Common Stock, Net		$ 99,000
Pre-funded Warrant [Member]
Class of Warrant or Right, Outstanding	946,429
Share Price	$ 2.8
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	1,071,429
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 2.65
Warrants and Rights Outstanding, Term	5 years 6 months
Warrants Issued in Connection with Underwritten Public Offering [Member]
Fair Value Adjustment of Warrants		$ 50,000