Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Stockholders' Equity - Warrants (Details)

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Note 9 - Stockholders' Equity - Warrants (Details) - USD ($)
6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Outstanding, number of shares (in shares) 1,592,775 1,074,171 1,592,775  
Outstanding, weighted average exercise price (in dollars per share) $ 2.55 $ 0.50 $ 2.55  
Outstanding, weighted average remaining life (Year) 2 years 109 days 2 years 266 days 4 years 36 days 76 days
Outstanding, intrinsic value   $ 880,449 $ 956,012  
Issued, number of shares (in shares) 1,749,171 6,459,000    
Issued, weighted average exercise price (in dollars per share) $ 0.50 $ 2.01    
Issued, weighted average remaining life (Year) 4 years 127 days 3 years    
Issued, intrinsic value $ 560,199    
Exercised, number of shares (in shares) (57,750) (1,133,975)    
Exercised, weighted average exercise price (in dollars per share) $ 0.50 $ 0.87    
Expired or cancelled, number of shares (in shares)    
Expired or cancelled, weighted average exercise price (in dollars per share)    
Outstanding , number of shares (in shares) 3,284,196 6,399,196 1,074,171 1,592,775
Outstanding , weighted average exercise price (in dollars per share) $ 1.49 $ 1.95 $ 0.50 $ 2.55