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Note 9 - Production Costs - Components of Production Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Salaries and wages $ 13,160 $ 13,440 $ 12,206
Expense from cash-settled share-based payment transactions 43 311
Consumable materials 12,143 9,916 8,853
Electricity costs 9,313 8,701 7,438
Site restoration 84 58 32
Pre-feasibility exploration cost 411 410 408
Safety 592 323 221
On mine administration 3,569 3,004 2,898
Other production cost 17 30
$ 39,315 $ 36,180 [1] $ 32,086
[1] Restated, refer note 4(a).