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Note 16 - Tax Expense - Recognised Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement Line Items [Line Items]      
Deferred tax asset $ 525 $ 1,409  
Deferred tax liability (6,503) (6,330)  
Net deferred tax asset (liability) (5,978) (4,921) $ (7,840)
Deferred tax asset (525) (1,409)  
Net deferred tax asset (liability) (5,978) (4,921) (7,840)
Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) [1] (5,978) (4,921)  
Net deferred tax asset (liability) [1] (5,978) (4,921)  
Property, plant, and equipment deferred tax liability [member]      
Statement Line Items [Line Items]      
Deferred tax asset 0 0  
Deferred tax liability (6,348) (6,323)  
Net deferred tax asset (liability) (6,348) (6,323) (9,328)
Deferred tax asset 0 0  
Net deferred tax asset (liability) (6,348) (6,323) (9,328)
Property, plant, and equipment deferred tax liability [member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) (6,348) (6,323)  
Net deferred tax asset (liability) (6,348) (6,323)  
Evaluation and exploration assets [member]      
Statement Line Items [Line Items]      
Deferred tax asset 0 0  
Deferred tax liability (146) (2)  
Net deferred tax asset (liability) (146) (2) (47)
Deferred tax asset 0 0  
Net deferred tax asset (liability) (146) (2) (47)
Evaluation and exploration assets [member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) (146) (2)  
Net deferred tax asset (liability) (146) (2)  
Allowance for obsolete stock deferred tax asset [member]      
Statement Line Items [Line Items]      
Deferred tax asset 65 163  
Deferred tax liability 0 0  
Net deferred tax asset (liability) 65 (163) 3
Deferred tax asset (65) (163)  
Net deferred tax asset (liability) 65 (163) 3
Allowance for obsolete stock deferred tax asset [member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 65 (163)  
Net deferred tax asset (liability) 65 (163)  
Prepayments deferred tax liability [member]      
Statement Line Items [Line Items]      
Deferred tax asset 0 0  
Deferred tax liability (9) (5)  
Net deferred tax asset (liability) (9) (5) (10)
Deferred tax asset 0 0  
Net deferred tax asset (liability) (9) (5) (10)
Prepayments deferred tax liability [member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) (9) (5)  
Net deferred tax asset (liability) (9) (5)  
Unrealised foreign exchange gains (losses) [member]      
Statement Line Items [Line Items]      
Deferred tax asset 0 733  
Deferred tax liability 0 0  
Net deferred tax asset (liability) 0 733 499
Deferred tax asset 0 (733)  
Net deferred tax asset (liability) 0 733 499
Unrealised foreign exchange gains (losses) [member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 0 733  
Net deferred tax asset (liability) 0 733  
Trade and Other Payables 1 [Member]      
Statement Line Items [Line Items]      
Deferred tax asset 190 814  
Deferred tax liability 0 0  
Deferred tax asset (190) (814)  
Trade and Other Payables 1 [Member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 190 814  
Net deferred tax asset (liability) 190 814  
Provisions [member]      
Statement Line Items [Line Items]      
Deferred tax asset 204 25  
Deferred tax liability 0 0  
Net deferred tax asset (liability) 204 25 54
Deferred tax asset (204) (25)  
Net deferred tax asset (liability) 204 25 $ 54
Provisions [member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 204 25  
Net deferred tax asset (liability) 204 25  
Other Temporary Differences 1 [Member]      
Statement Line Items [Line Items]      
Deferred tax asset 66 0  
Deferred tax liability 0 0  
Deferred tax asset (66) 0  
Other Temporary Differences 1 [Member] | Net tax assets (liabilities) [member]      
Statement Line Items [Line Items]      
Net deferred tax asset (liability) 66 0  
Net deferred tax asset (liability) $ 66 $ 0  
[1] The net deferred tax liability consists of a deferred tax asset of $153 (2022: $202) from the South African operation and a net deferred tax liability of $6,131 (2022: $5,123) due to the Zimbabwean operation. The amounts are in different tax jurisdictions and cannot be offset. The amounts are presented as part of non-current assets and non-current liabilities in the statements of financial position. The deferred tax asset recognised is supported by evidence of probable future taxable income.