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13. Stock Options: Share-based Compensation, Stock Options, Activity (Details) - shares
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Details      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 4,612,500 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 (650,000) (3,892,000)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 4,612,500