Note 9 - Warrants - Summary of Warrants Outstanding and Exercisable (Details)	6 Months Ended
	Jun. 30, 2022 $ / shares shares
Number outstanding/ exercisable (in shares)	2,850,000
Warrants Issued in Connection with Private Placement [Member]
Number outstanding/ exercisable (in shares)	2,500,000
Weighted average remaining life (Year)	4 years 1 month 13 days
Weighted average exercise price (in dollars per share) | $ / shares	$ 5.10
The Placement Agent Warrants [Member]
Number outstanding/ exercisable (in shares)	350,000
Weighted average remaining life (Year)	4 years 1 month 13 days
Weighted average exercise price (in dollars per share) | $ / shares	$ 6.45