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Note 6 - Blanket Zimbabwe Indigenisation Transaction (Details Textual) - USD ($)
 2 Months Ended 5 Months Ended 7 Months Ended 12 Months Ended 19 Months Ended
Nov. 05, 2018
Jun. 23, 2017
Feb. 20, 2012
Apr. 30, 2013
Feb. 28, 2013
Sep. 30, 2012
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 31, 2016
Dec. 20, 2018
Sep. 30, 2018
Jun. 30, 2018
Jun. 22, 2017
Dec. 31, 2015
Statement Line Items [Line Items]                              
Proportion of ownership interests held by non-controlling interests     51.00%       51.00%                
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent     $ 30,090,000                        
Non-controlling interest, non-refundable donation     $ 1,000,000                        
Dividend loans, Percentage of dividend as payment of interest   80.00% 80.00%                        
Proportion of dividends declared accruing unconditionally     20.00%                        
Borrowings, interest rate   7.25%                 6.00%        
Total borrowings             $ 5,960,000 $ 1,486,000 $ 2,987,000          
Percentage of net assets recognised as NCI     16.20%       16.20%                
Borrowings, adjustment to interest rate basis                           10.00%  
Expense from equity-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets   $ 806,000         $ 14,000 $ 835,000 [1] $ 170,000            
Dividends received                   $ 0          
Cash advances on dividend loans       $ 1,000,000 $ 1,000,000 $ 2,000,000                  
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 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    
NIEEF [member]                              
Statement Line Items [Line Items]                              
Proportion of ownership interests held by non-controlling interests     16.00%       16.00%                
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent     $ 11,740,000                        
Proportion of ownership interest sold     16.00%                        
Non-controlling interests recognised, dividends declared accruing unconditionally     20.00%                        
Non-controlling interests recognised, portion recognised to the extent net asset value exceeds faciliation loans     80.00%                        
Fremiro [member]                              
Statement Line Items [Line Items]                              
Proportion of ownership interests held by non-controlling interests     15.00%       15.00%                
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent     $ 11,010,000                        
Proportion of ownership interest sold     15.00%                        
Non-controlling interests recognised, dividends declared accruing unconditionally     20.00%                        
Non-controlling interests recognised, portion recognised to the extent net asset value exceeds faciliation loans     80.00%                        
BETS [member]                              
Statement Line Items [Line Items]                              
Proportion of ownership interests held by non-controlling interests             10.00%                
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent     $ 7,340,000                        
Proportion of ownership interest sold     10.00%                        
Community Trust [member]                              
Statement Line Items [Line Items]                              
Proportion of ownership interests held by non-controlling interests     10.00%       10.00%                
Proportion of ownership interest sold     10.00%                        
Non-controlling interests recognised, dividends declared accruing unconditionally     100.00%                        
Non-controlling interests recognised, portion recognised to the extent net asset value exceeds faciliation loans     80.00%                        
Non-controlling interests recognised, dividends declared accruing unconditionally employee participation     20.00%                        
Blanket Mine (1983) (Private) Limited [member]                              
Statement Line Items [Line Items]                              
Proportion of ownership interest in subsidiary 64.00%           49.00% [2],[3] 49.00% [2],[3]              
[1] Restated, refer note 4(a).
[2] Blanket has no subsidiary companies
[3] Refer to Note 6, for the effective shareholding. NCI has a 16.2% interest in cash flows of Blanket only.