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Note 6 - Common Stock, Preferred Stock, Warrants and Options - Option Activity (Details) - USD ($)
12 Months Ended
Aug. 07, 2019
Dec. 31, 2019
Dec. 31, 2018
Granted, Shares (in shares) 21,500,000    
Granted, Weighted average exercise price (in dollars per share) $ 0.041    
Share-based Payment Arrangement, Option [Member]      
Outstanding, Shares (in shares)   216,557  
Outstanding, Weighted average exercise price (in dollars per share)   $ 3.51  
Outstanding, Weighted average remaining life (Year)   4 years 229 days 7 years 94 days
Outstanding, Aggregate intrinsic value  
Granted, Shares (in shares)   21,500,000  
Granted, Weighted average exercise price (in dollars per share)   $ 0.04  
Granted, Weighted average remaining life (Year)   4 years 222 days  
Expired, Shares (in shares)    
Expired, Weighted average exercise price (in dollars per share)    
Expired, Weighted average remaining life    
Exercised, Shares (in shares)    
Exercised, Weighted average exercise price (in dollars per share)    
Outstanding, Shares (in shares)   21,716,557 216,557
Outstanding, Weighted average exercise price (in dollars per share)   $ 0.08 $ 3.51
Exercisable, Shares (in shares)   21,716,557  
Exercisable, Weighted average exercise price (in dollars per share)   $ 0.08  
Exercisable, Weighted average remaining life (Year)   4 years 229 days  
Exercisable, Aggregate intrinsic value