Note 3 - Liquidity and Summary of Significant Accounting Principles (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2022			2021
Risk free rate	1.65%	-	3.47%		0.26	%
Weighted average expected years until exercise	5	-	6		5
Expected stock volatility		100%			100	%
Dividend yield		-			-

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Nine months ended September 30, 2022		Nine months ended September 30, 2021
Shares underlying:
Common stock options		3,376,667		1,355,001
Stock purchase warrants		450,000		7,098,794
		3,826,667		8,453,795