Note 8 - Derivatives (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
A, B and Agent Warrants [Member]
Derivative Liability	$ 1,036		$ 1,036		$ 3,355
Derivative, Gain (Loss) on Derivative, Net	1,900	$ 30,976	2,319	$ 32,166
Agent Warrants Issued in Connection with May 2020 Offering [Member]
Derivative Liability	1,709		1,709		4,479
Derivative, Gain (Loss) on Derivative, Net	2,435	31,546	2,770	32,051
Agent Warrants In Connection With June 2020 Warrant [Member]
Derivative Liability	2,827		2,827		$ 5,999
Derivative, Gain (Loss) on Derivative, Net	$ 2,973	$ 32,733	$ 3,172	$ 32,945