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12. Stock Options: Share-based Compensation, Stock Options, Activity (Details) - shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Details        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 5,012,500   5,262,500 7,054,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures   2,100,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (250,000) (3,892,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 5,012,500