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Note 9 - Stock Option and Stock Plans - Stock Option Activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Options, Outstanding (in shares) 4,945,000  
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 0.38  
Weighted Average Remaining Contractual Term, Outstanding (Year) 8 years 9 years
Aggregate Intrinsic Value, Outstanding
Number of Options, Granted (in shares) 4,945,000  
Weighted Average Exercise Price, Granted (in dollars per share) $ 0.38  
Weighted Average Remaining Contractual Term, Granted (Year)  
Number of Options, Exercised (in shares) 0 0  
Number of Options, Expired or Forfeited (in shares)    
Weighted Average Exercise Price, Expired or Forfeited (in dollars per share)    
Number of Options, Forfeited (in shares) 288,000    
Weighted Average Exercise Price, Forfeited (in dollars per share) $ 0.38    
Number of Options, Outstanding (in shares) 4,657,000 [1] 4,945,000
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 0.038 $ 0.38
Number of Options, Vested (in shares) 1,217,375    
Weighted Average Exercise Price, Vested (in dollars per share) $ 0.038    
Weighted Average Remaining Contractual Term, Vested (Year) 8 years    
Aggregate Intrinsic Value, Vested    
[1] There is one stock owner over 10% currently holding 500,000 qualified options. The exercise price for this option-holder would be $0.418 with an exercise period of 5 years and a vesting period of 4 years at 25% per year.