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Note 38 - Subsequent events (Details Textual)
R in Millions
 1 Months Ended 12 Months Ended
Jan. 11, 2019
USD ($)
shares
Jan. 10, 2019
USD ($)
Nov. 05, 2018
shares
May 31, 2018
USD ($)
Feb. 28, 2019
ZAR (R)
Feb. 28, 2019
USD ($)
May 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Statement Line Items [Line Items]                          
Total borrowings               $ 5,960,000 $ 1,486,000     $ 2,987,000
Blanket Mine (1983) (Private) Limited [member]                          
Statement Line Items [Line Items]                          
Proportion of ownership interest in subsidiary     64.00%         49.00% [1],[2] 49.00% [1],[2]        
Femiro [Member]                          
Statement Line Items [Line Items]                          
Proportion of ownership interest acquired     15.00%                    
Number of instruments or interests issued or issuable for cancellation of loan | shares     727,266                    
Shares issued or issuable, price per share     7.15                    
Femiro [Member] | Facilitation loan [member]                          
Statement Line Items [Line Items]                          
Total borrowings                   $ 11,468,000 $ 11,467,000    
SH Minerals [member]                          
Statement Line Items [Line Items]                          
Share sale agreement, amendment, purchase price       $ 3,000,000     $ 3,000,000            
Share sale agreement, amendment, amount of each payment       $ 1,000,000     $ 1,000,000            
RSU and PSU settlement and new grants [member]                          
Statement Line Items [Line Items]                          
Number of shares issued to settled share-based payments arrangement | shares 93,664                        
Payments to settled share-based payments arrangement $ 885,000                        
Gold hedge [member] | Derivative contract for 4,500 ounces of Gold [member] | Commodity price risk [member]                          
Statement Line Items [Line Items]                          
Derivative contract, number of ounces of gold hedged   4,500                      
Hedging instruments, protected, price   $ 1,250                      
Sales agreement with Eersteling Gold Mining Company Limited [member] | SH Minerals [member]                          
Statement Line Items [Line Items]                          
Share sale agreement, amendment, amount of payment, received         R 13 $ 1,000,000              
Performance share units (PSUs) [member]                          
Statement Line Items [Line Items]                          
Vesting period of other equity instruments               3          
Performance share units (PSUs) [member] | RSU and PSU settlement and new grants [member]                          
Statement Line Items [Line Items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement 224,667                        
Number of other equity instruments granted in share-based payment arrangement 95,740                        
Vesting period of other equity instruments 3                        
Restricted stock units (RSUs) [member]                          
Statement Line Items [Line Items]                          
Vesting period of other equity instruments               3          
Restricted stock units (RSUs) [member] | RSU and PSU settlement and new grants [member]                          
Statement Line Items [Line Items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement 69,307                        
[1] Blanket has no subsidiary companies
[2] Refer to Note 6, for the effective shareholding. NCI has a 16.2% interest in cash flows of Blanket only.