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Note 9 - Production Costs - Components of Production Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]      
Salaries and wages $ 16,122 $ 13,905 $ 13,160
Consumable materials – Operations 14,938 13,020 12,143
Consumable materials – COVID-19 824
Electricity costs 8,312 6,383 9,313
Site restoration 84
Safety 708 525 592
Cash-settled share-based expense (note 30.1(a)) 634 107 43
On mine administration 1,800 2,159 3,569
Pre-feasibility exploration costs 373 301 411
Cost of sales $ 43,711 $ 36,400 $ 39,315