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Note 6 - Production Costs - Components of Production Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Statement Line Items [Line Items]        
Salaries and wages     $ 8,849 $ 7,727
Consumable materials     7,589 5,466
Electricity costs     3,959 2,715
Site restoration     10
Safety     368 399
Cash-settled share-based expense (note 10(a))     191 70
On mine administration     1,010 797
Pre-feasibility exploration costs     172 156
Cost of sales $ 11,451 $ 7,571 $ 22,138 $ 17,340