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Note 8 - Stockholders' Equity (Details Textual) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Dec. 07, 2017
Dec. 06, 2017
Preferred Stock, Shares Authorized 10,000,000 10,000,000    
Preferred Stock, Par or Stated Value Per Share $ 0.001 $ 0.001    
Preferred Stock, Shares Outstanding, Ending Balance 0 0    
Common Stock, Shares Authorized 400,000,000 400,000,000 400,000,000 250,000,000
Common Stock, Par or Stated Value Per Share $ 0.001 $ 0.001 $ 0.001  
Common Stock, Shares, Issued, Total 173,638,549 140,763,549    
Stock Issued During Period, Shares, Issued for Services 1,500,000      
Shares Issued, Price Per Share $ 0.04      
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.15 $ 0.14    
Stock Issued During Period, Shares, in Lieu of Payment for Fees Associated with Private Placement   2,275,000    
Stock Issued During Period, in Lieu of Payment for Fees Associated with Private Placement, Price Per Share   $ 0.04    
Stock Issued During Period, Shares, Warrant Exercised   3,125,000    
Stock Issued During Period, Warrant Exercised, Exercise price   $ 0.04    
Common Stock, Shares, Outstanding, Ending Balance 173,638,549 140,763,549    
Director [Member]        
Stock Issued During Period, Shares, Issued for Services   250,000    
Shares Issued, Price Per Share   $ 0.36    
Sale of Stock, One [Member]        
Shares Issued, Price Per Share $ 0.04      
Stock Issued During Period, Shares, New Issues 17,375,000      
Sale of Stock, Two [Member]        
Shares Issued, Price Per Share $ 0.05      
Stock Issued During Period, Shares, New Issues 3,000,000      
Sale of Stock, Three [Member]        
Shares Issued, Price Per Share $ 0.10      
Stock Issued During Period, Shares, New Issues 1,000,000      
Sale of Stock, Four [Member]        
Shares Issued, Price Per Share $ 0.04      
Stock Issued During Period, Shares, New Issues 2,000,000      
Private Placement [Member]        
Shares Issued, Price Per Share $ 0.15      
Stock Issued During Period, Shares, New Issues 8,000,000 26,500,000    
Convertible Units, Number of Warrants Called by Each Unit 1 1    
Convertible Units, Number of Common Shares Called by Each Unit 1 1    
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right 1 0.25    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.08 $ 0.04