Note 10 - Derivatives (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Agent Warrants In Connection With March 2020 Private Placement [Member]
Derivative Liability, Total	$ 0		$ 0		$ 135
Derivative, Gain (Loss) on Derivative, Net, Total		$ 743	135	$ 3,062
Agent Warrants Issued in Connection with May 2020 Offering [Member]
Derivative Liability, Total	0		0		333
Derivative, Gain (Loss) on Derivative, Net, Total		1,133	333	3,903
Agent Warrants In Connection With June 2020 Warrant [Member]
Derivative Liability, Total	1		1		$ 908
Derivative, Gain (Loss) on Derivative, Net, Total	$ 7	$ 1,587	$ 907	$ 4,759