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Note 10 - Other Income - Components of Other Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]      
Other $ 70 $ 94 $ 39
Eersteling rock dump sale 217
Other income 4,765 2,274 7,101
Greenstone retirement fund [member]      
Statement Line Items [Line Items]      
Greenstone Fund pay-out 250
Greenstone provident fund [member]      
Statement Line Items [Line Items]      
Greenstone Fund pay-out 363
Gold sale export incentive [member]      
Statement Line Items [Line Items]      
Government grant 4,695 866 6,482
Gold support price [member]      
Statement Line Items [Line Items]      
Government grant $ 1,064