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 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Outstanding, shares (in shares) 1,220,000 1,349,000   1,349,000  
Outstanding, weighted average exercise price (in dollars per share) $ 0.24 $ 0.23   $ 0.23  
Options granted, shares (in shares) 10,000 3,000 10,000 3,000
Options granted, weighted average exercise price (in dollars per share) $ 0.15      
Options exercised, shares (in shares) 0 (10,000) 0 (10,000)
Options exercised, weighted average exercise price (in dollars per share)      
Options expired, shares (in shares) (10,000) (129,000)      
Options expired, weighted average exercise price (in dollars per share) $ 0.19 $ 0.17      
Options forfeited, shares (in shares)      
Options forfeited, weighted average exercise price (in dollars per share)      
Outstanding, shares (in shares) 1,220,000 1,220,000   1,220,000  
Outstanding, weighted average exercise price (in dollars per share) $ 0.24 $ 0.24   $ 0.24  
Outstanding, weighted average remaining contractual term (Year) 3 years 273 days        
Outstanding, aggregate intrinsic value $ 37,353     $ 37,353  
Exercisable, shares (in shares) 1,207,000     1,207,000  
Exercisable, weighted average exercise price (in dollars per share) $ 0.24     $ 0.24  
Exercisable, weighted average remaining contractual term (Year) 3 years 244 days        
Exercisable, aggregate intrinsic value $ 36,703     $ 36,703