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Note 17 - Property, Plant, and Equipment - Reconciliation of Changes in Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]      
Balance at beginning of period $ 106,512 [1] $ 90,460  
Additions* 24,778 20,423  
Impairments (144) $ (208)
Balance at end of period 126,479 106,512 [1] 90,460
Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 141,326 120,848  
Initial recognition of right of use assets   409  
Additions* [2] 24,778 20,423  
Impairments   (144)  
Disposals   (228)  
Reallocations between asset classes  
Foreign exchange movement (4) 18  
Derecognised plant and equipment (238)    
Balance at end of period 165,862 141,326 120,848
Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Initial recognition of right of use assets   146  
Foreign exchange movement (3) 11  
Derecognised plant and equipment (56)    
Balance 34,814 30,388  
Depreciation for the year 4,628 4,434  
Disposals   (165)  
Balance 39,383 34,814 30,388
Land and buildings [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 5,420 5,928  
Balance at end of period 5,311 5,420 5,928
Land and buildings [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 10,833 10,339  
Initial recognition of right of use assets   409  
Additions* [2] 1 267  
Impairments    
Disposals   (212)  
Reallocations between asset classes 930 25  
Foreign exchange movement (7) 5  
Derecognised plant and equipment    
Balance at end of period 11,757 10,833 10,339
Land and buildings [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Initial recognition of right of use assets   146  
Foreign exchange movement 3  
Derecognised plant and equipment    
Balance 5,413 4,411  
Depreciation for the year 1,030 1,005  
Disposals   (149)  
Balance 6,446 5,413 4,411
Mining assets [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 84,217 68,688  
Balance at end of period 101,866 84,217 68,688
Mining assets [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 90,542 74,509  
Initial recognition of right of use assets    
Additions* [2] 19,507 19,020  
Impairments    
Disposals    
Reallocations between asset classes (1,210) (2,989)  
Foreign exchange movement 2  
Derecognised plant and equipment    
Balance at end of period 108,839 90,542 74,509
Mining assets [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Initial recognition of right of use assets    
Foreign exchange movement  
Derecognised plant and equipment    
Balance 6,325 5,821  
Depreciation for the year 648 504  
Disposals    
Balance 6,973 6,325 5,821
Plant and equipment [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 16,345 15,318  
Balance at end of period 17,959 16,345 15,318
Plant and equipment [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 36,395 32,675  
Initial recognition of right of use assets    
Additions* [2] 4,221 897  
Impairments   (144)  
Disposals    
Reallocations between asset classes 280 2,964  
Foreign exchange movement (14) 3  
Derecognised plant and equipment (238)    
Balance at end of period 40,644 36,395 32,675
Plant and equipment [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Initial recognition of right of use assets    
Foreign exchange movement  
Derecognised plant and equipment (56)    
Balance 20,050 17,357  
Depreciation for the year 2,691 2,693  
Disposals    
Balance 22,685 20,050 17,357
Fixtures and fittings [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 265 274  
Balance at end of period 386 265 274
Fixtures and fittings [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 1,018 923  
Initial recognition of right of use assets    
Additions* [2] 219 88  
Impairments    
Disposals    
Reallocations between asset classes  
Foreign exchange movement (2) 7  
Derecognised plant and equipment    
Balance at end of period 1,235 1,018 923
Fixtures and fittings [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Initial recognition of right of use assets    
Foreign exchange movement (6) 5  
Derecognised plant and equipment    
Balance 753 649  
Depreciation for the year 102 99  
Disposals    
Balance 849 753 649
Motor vehicles [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 265 252  
Balance at end of period 565 265 252
Motor vehicles [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 2,538 2,402  
Initial recognition of right of use assets    
Additions* [2] 458 151  
Impairments    
Disposals   (16)  
Reallocations between asset classes  
Foreign exchange movement (1) 1  
Derecognised plant and equipment    
Balance at end of period 2,995 2,538 2,402
Motor vehicles [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Initial recognition of right of use assets    
Foreign exchange movement 6  
Derecognised plant and equipment    
Balance 2,273 2,150  
Depreciation for the year 157 133  
Disposals   (16)  
Balance 2,430 2,273 2,150
Solar plant [member]      
Statement Line Items [Line Items]      
Balance at beginning of period  
Balance at end of period 392
Solar plant [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period  
Initial recognition of right of use assets    
Additions* [2] 372  
Impairments    
Disposals    
Reallocations between asset classes  
Foreign exchange movement 20  
Derecognised plant and equipment    
Balance at end of period 392
Solar plant [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Initial recognition of right of use assets    
Foreign exchange movement  
Derecognised plant and equipment    
Balance  
Depreciation for the year  
Disposals    
Balance
[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.
[2] Included in additions is an amount of $15,771 (2019: $14,051, 2018: $19,323) relating to capital work in progress ("CWIP") and contains $53 (December 31, 2019: $165, 2018: $61) of borrowing costs capitalised from the term loan. As at year end $85,479 of CWIP was included in the cost closing balance (2019: $69,708, January 1, 2019: $55,657). On July 6, 2020 the Board appointed Voltalia as the contractor for engineering, procuring and constructing a solar plant to be owned by a subsidiary of the Company. All solar costs that were incurred before July 6, 2020 were accounted for as other expenses and accounted through profit or loss. Solar costs incurred after approval by the Board are accounted for as Property, plant and equipment as it became clear and probable that future economic benefits will flow to the project. The 40-hectare site for the project has been cleared and fenced and is ready for civil work to commence. Construction on the 12MWac solar plant is expected to be completed in April 2022.