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Note 9 - Warrants - Summary of Warrants Outstanding and Exerciseable (Details) - $ / shares
3 Months Ended
Mar. 31, 2021
Feb. 11, 2021
Dec. 31, 2020
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) 5 years 160 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 160 days    
Weighted average exercise price (in dollars per share) $ 6.45 $ 6.45