Note 6 - Stock-based Compensation Expense (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

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

Weighted average risk-free interest rates	3.54	%
Expected dividend yield	0.0	%
Expected life of option (in years)	7.0
Expected volatility	160.0	%

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	2023		2022
Stock options:
Research and development	$	291,094	$	225,031
General and administrative		564,030		548,346
Total stock option expense		855,124		773,377
Stock awards (consultants):
General and administrative		219,833		128,697
Total stock-based compensation expense	$	1,074,957	$	902,074