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22. SUPPLEMENTAL FINANCIAL INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfOperatingExpensesLineItems [Line Items]    
Cost of goods and services sold $ (10,414) $ (10,021)
Operating expenses (10,616) (10,622)
Operating Overheads: Mining, other development expense    
DisclosureOfOperatingExpensesLineItems [Line Items]    
Cost of goods and services sold (813) (689)
Operating Overheads: Milling, conversion expense    
DisclosureOfOperatingExpensesLineItems [Line Items]    
Cost of goods and services sold (2,993) (2,414)
Less absorption: Mineral properties    
DisclosureOfOperatingExpensesLineItems [Line Items]    
Cost of goods and services sold 39 39
Cost of services    
DisclosureOfOperatingExpensesLineItems [Line Items]    
Cost of goods and services sold (6,528) (6,957)
Inventory-non cash adjustments    
DisclosureOfOperatingExpensesLineItems [Line Items]    
Cost of goods and services sold (119)  
Cost of goods and services sold    
DisclosureOfOperatingExpensesLineItems [Line Items]    
Operating expenses (10,414) (10,021)
Reclamation asset amortization    
DisclosureOfOperatingExpensesLineItems [Line Items]    
Operating expenses (146) (140)
Reclamation liability adjustments    
DisclosureOfOperatingExpensesLineItems [Line Items]    
Operating expenses $ (56) $ (461)