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10. Stockholders' Equity: Warrant expirations (Details) - shares
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Details      
Warrants issued 1,200,000    
Warrants issued, exercise price 0.10    
Warrants issued 2,137,500    
Warrants issued, exercise price 0.20    
Warrants issued 4,250,000    
Warrants issued, exercise price 0.20    
Warrants issued 1,708,334    
Warrants issued, exercise price 0.20    
Warrants issued 4,429,289    
Warrants issued, exercise price 0.22    
Class of Warrant or Right, Outstanding 13,725,123 9,295,834 10,737,500