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Note 6 - Common Stock, Preferred Stock, Warrants and Options - Summary of Warrants (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.052 $ 6,589
Class of Warrant or Right, Outstanding 570,000 1,061
Warrant exercisable, weighted average remaining contractual life (Year) 4 years 306 days  
Warrant exercisable, number of warrants (in shares) 570,000