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10. Stockholders' Equity: Warrant Expirations (Details) - shares
 3 Months Ended
Mar. 31, 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 2,506,212    
Warrants issued, exercise price 0.22    
Class of Warrant or Right, Outstanding 11,802,046 9,295,834 10,737,500