Note 8 - Common Stock Warrant Liabilities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	May 01, 2024	Jan. 05, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	May 31, 2024	Apr. 28, 2024	Mar. 31, 2024	Jan. 31, 2024	Dec. 31, 2023	Jan. 31, 2023
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 8.64		$ 8.64		$ 8.64			$ 29.5		$ 32.42
Fair Value Adjustment of Warrants			$ (18)	$ (2,572)	$ (157)	$ (1,544)
January 2024 Warrant Inducement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)									441,076		25,871
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)									$ 22.545		$ 22.545
January 2023 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)													25,871
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 22.545											$ 116.25
Warrants and Rights Outstanding		$ 300
Fair Value Adjustment of Warrants		$ 100
May 2024 Warrant Inducement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								689,680
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 6.2	$ 6.2
Fair Value Adjustment of Warrants	$ 200
October 2022 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)									27,271
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)									$ 116.25
Warrants and Rights Outstanding	100
Fair Value Adjustment of Warrants	$ (100)