Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock-based Compensation - Stock Option Activity (Details)

v3.20.2
Note 4 - Stock-based Compensation - Stock Option Activity (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Outstanding, shares (in shares) 1,220,000 1,220,000 1,349,000   1,349,000  
Options granted, shares (in shares) 210,000 10,000 0 220,000 3,000
Options exercised, shares (in shares) 0 0 0 (10,000)
Options expired, shares (in shares) (10,000) (129,000)      
Options forfeited, shares (in shares)      
Outstanding, shares (in shares) 1,430,000 1,220,000 1,220,000   1,430,000  
Exercisable, shares (in shares) 1,208,500       1,208,500  
Outstanding, weighted average exercise price (in dollars per share) $ 0.24 $ 0.24 $ 0.23   $ 0.23  
Options granted, weighted average exercise price (in dollars per share) 0.66 0.15      
Options exercised, weighted average exercise price (in dollars per share)      
Options expired, weighted average exercise price (in dollars per share) 0.19 0.17      
Options forfeited, weighted average exercise price (in dollars per share)      
Outstanding, weighted average exercise price (in dollars per share) 0.30 $ 0.24 $ 0.24   0.30  
Exercisable, weighted average exercise price (in dollars per share) $ 0.24       $ 0.24  
Outstanding, weighted average remaining contractual term (Year)         4 years 151 days  
Exercisable, weighted average remaining contractual term (Year)         3 years 151 days  
Outstanding, aggregate intrinsic value $ 487,773       $ 487,773  
Exercisable, aggregate intrinsic value $ 482,268       $ 482,268