Note 9 - Warrants - Summary of Warrants Outstanding and Exerciseable (Details) - $ / shares	6 Months Ended
	Jun. 30, 2021	Feb. 11, 2021	Dec. 31, 2020
Number outstanding/ exercisable (in shares)	2,850,000		0
Warrants Issued in Connection with Private Placement [Member]
Number outstanding/ exercisable (in shares)	2,500,000
Weighted average remaining life (Year)	5 years 1 month 13 days
Weighted average exercise price (in dollars per share)	$ 5.10	$ 5.10
The Placement Agent Warrants [Member]
Number outstanding/ exercisable (in shares)	350,000
Weighted average remaining life (Year)	5 years 1 month 13 days
Weighted average exercise price (in dollars per share)	$ 6.45	$ 6.45