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Note 4 - Stock Options and Warrants - Warrant Activity (Details) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Warrants, number of shares (in shares) 84,295
Warrants, exercise price (in dollars per share) $ 1.95
Issued, number of shares (in shares)   84,295
Issued, exercise price (in dollars per share)   $ 1.95
Warrants, average remaining life (Year) 8 years 208 days 4 years 193 days
Exercised during 2020 (in shares) (115,385)  
Exercised during 2020 (in dollars per share) $ 0.01  
Warrants, number of shares (in shares) 476,348 84,295
Warrants, exercise price (in dollars per share) $ 0.97 $ 1.95
Warrants and Exercise Price 2020, First Issuance [Member]    
Issued, number of shares (in shares) 115,385  
Issued, exercise price (in dollars per share) $ 0.01  
Warrants and Exercise Price 2020, Second Issuance [Member]    
Issued, number of shares (in shares) 32,053  
Issued, exercise price (in dollars per share) $ 1.95  
Warrants and Exercise Price 2020, Third Issuance [Member]    
Issued, number of shares (in shares) 360,000  
Issued, exercise price (in dollars per share) $ 1