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Note 4 - Common Stock (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Jul. 10, 2019
Apr. 26, 2019
Mar. 26, 2019
Feb. 26, 2019
Feb. 28, 2019
Nov. 30, 2017
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Common Stock, Shares Authorized             100,000,000   100,000,000
Common Stock, Shares Outstanding and Reserved             48,177,624    
Common Stock, Shares, Issued, Total             40,216,351   39,117,524
Common Stock, Shares Subscribed but Unissued             2,078,726    
Proceeds from Issuance of Private Placement             $ 25,000  
Shares Issued, Price Per Share   $ 0.371              
Dividends, Total             $ 0    
Finders [Member]                  
Shares Issued, Price Per Share     $ 0.25            
Stock Issued During Period, Shares, Issued for Services     115,000            
Stock Issued During Period, Value, Issued for Services     $ 28,750            
Warrant [Member]                  
Common Stock, Capital Shares Reserved for Future Issuance             452,617    
Nonqualified Options [Member]                  
Common Stock, Capital Shares Reserved for Future Issuance             3,995,000    
Qualified Options [Member]                  
Common Stock, Capital Shares Reserved for Future Issuance             950,000    
Private Placement [Member]                  
Common Stock, Capital Shares Reserved for Future Issuance             300,000    
Private Placement 2016-2 [Member]                  
Proceeds from Issuance of Private Placement           $ 56,225      
Private Placement 2016-3 [Member]                  
Stock Issued During Period, Shares, New Issues 533,333       200,000        
Shares Issued, Price Per Share $ 0.1875       $ 0.25        
Officer [Member]                  
Common Stock, Capital Shares Reserved for Future Issuance             147,095    
Employees [Member]                  
Common Stock, Capital Shares Reserved for Future Issuance             6,315    
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period   4,043              
Consultants [Member]                  
Common Stock, Capital Shares Reserved for Future Issuance             31,520    
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total         24,000        
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period   16,170              
Chief Executive Officer [Member]                  
Shares Issued, Price Per Share $ 0.168                
Deferred Compensation Arrangement with Individual, Shares Issued       100,000          
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 18,819 67,377              
Vice President [Member]                  
Deferred Compensation Arrangement with Individual, Shares Issued       12,000          
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period   8,085