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Note 10 - Other Income - Components of Other Income (Details)
$ in Thousands, R in Millions
 12 Months Ended
Dec. 31, 2019
ZAR (R)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Statement Line Items [Line Items]        
Other   $ 94 $ 39 $ 148
Greenstone Fund pay-out R 3.6 250    
Eersteling rock dump sale   217
  2,274 7,101 [1] 2,594 [1]
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   866 6,482 2,446
Gold support price [member]        
Statement Line Items [Line Items]        
Government grant   $ 1,064
[1] The Group initially applied IFRS 16 on January 1, 2019, using the modified retrospective approach. Under this approach, comparative information is not restated. There was no cumulative effect of initially applying IFRS 16 to recognise in retained earnings at the date of initial application.