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SUPPLEMENTARY CASH FLOW INFORMATION (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net change in non-cash working capital items:      
Accounts payable and accrued liabilities $ (136,244) $ 708,055 $ (401,754)
Inventory (2,564,647) (40,743) (234,031)
Amounts due to related parties 1,189 42,007 (34,034)
Current taxes recoverable (2,828,570) (1,323,465) (776,231)
Amounts receivable (1,584,985) (354,697) (480,960)
Prepaid expenses and other assets (1,671,939) (114,703) (150,016)
Current taxes payable (291,907) (14,524) (24,247)
Net change in non-cash working capital items $ (9,077,103) $ (1,098,070) $ (2,101,273)