Note 6 - Stock-Based Compensation Expense - Schedule of Stock-Based Compensation Expense (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Total stock-based compensation expense	$ 238,566	$ 85,750	$ 650,895	$ 249,303
Share-Based Payment Arrangement, Option [Member]
Total stock-based compensation expense	190,191	56,190	570,573	168,570
Share-Based Payment Arrangement, Option [Member] | Research and Development Expense [Member]
Total stock-based compensation expense	54,293	21,468	162,878	64,404
Share-Based Payment Arrangement, Option [Member] | General and Administrative Expense [Member]
Total stock-based compensation expense	135,898	34,722	407,695	104,166
Restricted Stock [Member] | General and Administrative Expense [Member]
Total stock-based compensation expense	$ 48,375	$ 29,560	$ 80,322	$ 80,733