Note 6 - Derivatives (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
A, B and Agent Warrants [Member]
Derivative Liability	$ 2,936		$ 3,355
Derivative, Gain (Loss) on Derivative, Net	419	$ 1,190
Agent Warrants Issued in Connection with May 2020 Offering [Member]
Derivative Liability	4,144		4,479
Derivative, Gain (Loss) on Derivative, Net	335	505
Agent Warrants In Connection With June 2020 Warrant [Member]
Derivative Liability	5,800		$ 5,999
Derivative, Gain (Loss) on Derivative, Net	$ 199	$ 213