Note 7 - Warrants - Summary of Warrants Outstanding and Exercisable (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Feb. 11, 2021
Number outstanding/ exercisable (in shares)	2,850,000	2,850,000
Warrants Issued in Connection with Private Placement [Member]
Number outstanding/ exercisable (in shares)	2,500,000
Weighted average remaining life (Year)	2 years 7 months 13 days
Weighted average exercise price (in dollars per share)	$ 5.1		$ 5.1
The Placement Agent Warrants [Member]
Number outstanding/ exercisable (in shares)	350,000
Weighted average remaining life (Year)	2 years 7 months 13 days
Weighted average exercise price (in dollars per share)	$ 6.45		$ 6.45