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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
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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.

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