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Note 16 - Tax Expense (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
 [1]
Statement Line Items [Line Items]          
Applicable tax rate   0.00% 0.00% 0.00%  
Total average effective tax rate   37.52%      
Net deferred tax assets   $ 87 $ 63 [1]   $ 98
Net deferred tax liabilities   4,234 3,129 [1]   $ 23,328
South African operations [member]          
Statement Line Items [Line Items]          
Net deferred tax assets   87 63 $ 98  
Zimbabwean operations [member]          
Statement Line Items [Line Items]          
Net deferred tax liabilities   $ 4,234 $ 3,129 $ 23,328  
Zimbabwean operations [member]          
Statement Line Items [Line Items]          
Tax rate effect of foreign tax rates   25.75%      
Zimbabwean operations [member] | Changes in tax rates or tax laws enacted or announced [member]          
Statement Line Items [Line Items]          
Tax rate effect of foreign tax rates 24.72%        
South African operations [member]          
Statement Line Items [Line Items]          
Tax rate effect of foreign tax rates   28.00%      
[1] The Group voluntarily changed its disclosure policy for exploration and evaluation assets to be disclosed separately as Exploration and evaluation assets rather than as part of Property, plant and equipment; similarly lease liabilities were classified separately from trade and other payables (refer to note 4(b)(i) and 4(b)(ii)). The new disclosure policies were adopted from December, 2020 and have been applied retrospectively.