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4. Joint Ventures: Schedule of change in non-controlling interest (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Details          
Non-controlling interests $ 3,129,908   $ 3,129,908   $ 3,142,312
Proceeds from contributions from noncontrolling interest 14,903   14,903    
Net income (loss) attributable to non-controlling interest $ (16,274) $ 13,633 $ (27,307) $ 13,609