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Note 21 - Prepayments - Prepayments (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Statement Line Items [Line Items]    
Solar prepayments $ 104 $ 2,951
Other prepayments 162 661
Current prepayments and other current assets 3,693 6,930
South African operations [member]    
Statement Line Items [Line Items]    
Current advances to suppliers 254 1,552
Zimbabwean operations [member] | Blanket Mine [member]    
Statement Line Items [Line Items]    
Current advances to suppliers 1,494 1,766
Zimbabwean operations [member] | Bilboes [member]    
Statement Line Items [Line Items]    
Current advances to suppliers 802 0
Bilboes pre-effective date costs (note 5) $ 877 $ 0