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Note 15 - Property, Plant, and Equipment - Reconciliation of Changes in Property, Plant, and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | $ 64,873 |
Additions** |  | 20,949 | $ 19,159
Balance at end of period |  | 82,078 | 64,873
Gross carrying amount [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 88,079 | 69,343
Additions** | [1] | 20,949 | 19,159
Disposals and scrappings |  | (2) | (557)
Reallocations between asset classes |  |  |
Foreign exchange movement |  | 38 | 134
Impairments |  | (12) |
Balance at end of period |  | 109,052 | 88,079
Accumulated depreciation, amortisation and impairment [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 23,206 | 20,125
Disposals and scrappings |  |  | (510)
Foreign exchange movement |  | 5 | 80
Impairments |  |  | 20
Depreciation for the year |  | 3,763 | 3,491
Balance at end of period |  | 26,974 | 23,206
Land and buildings [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 5,417 |
Balance at end of period |  | 5,798 | 5,417
Land and buildings [member] | Gross carrying amount [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 8,367 | 7,989
Additions** | [1] |  |
Disposals and scrappings |  |  |
Reallocations between asset classes |  | 1,051 | 361
Foreign exchange movement |  | 16 | 17
Impairments |  |  |
Balance at end of period |  | 9,434 | 8,367
Land and buildings [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 2,950 | 2,321
Disposals and scrappings |  |  |
Foreign exchange movement |  |  |
Impairments |  |  |
Depreciation for the year |  | 686 | 629
Balance at end of period |  | 3,636 | 2,950
Mining assets [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 40,537 |
Balance at end of period |  | 56,326 | 40,537
Mining assets [member] | Gross carrying amount [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 45,078 | 31,158
Additions** | [1],[2] | 17,464 | 17,545
Disposals and scrappings |  |  |
Reallocations between asset classes |  | (1,051) | (3,699)
Foreign exchange movement |  | 7 | 74
Impairments |  |  |
Balance at end of period |  | 61,498 | 45,078
Mining assets [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 4,541 | 3,781
Disposals and scrappings |  |  |
Foreign exchange movement |  |  | 61
Impairments |  |  |
Depreciation for the year |  | 631 | 699
Balance at end of period |  | 5,172 | 4,541
Tangible exploration and evaluation assets [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 6,967 |
Balance at end of period |  | 6,967 | 6,967
Tangible exploration and evaluation assets [member] | Gross carrying amount [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 6,967 | 6,224
Additions** | [1] |  | 739
Disposals and scrappings |  |  |
Reallocations between asset classes |  |  |
Foreign exchange movement |  |  | 4
Impairments |  |  |
Balance at end of period |  | 6,967 | 6,967
Tangible exploration and evaluation assets [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  |  |
Disposals and scrappings |  |  |
Foreign exchange movement |  |  |
Impairments |  |  |
Depreciation for the year |  |  |
Balance at end of period |  |  |
Machinery [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 11,307 |
Balance at end of period |  | 12,499 | 11,307
Machinery [member] | Gross carrying amount [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 24,536 | 20,626
Additions** | [1] | 3,377 | 572
Disposals and scrappings |  |  |
Reallocations between asset classes |  | (20) | 3,338
Foreign exchange movement |  |  |
Impairments |  | (12) |
Balance at end of period |  | 27,881 | 24,536
Machinery [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 13,229 | 11,524
Disposals and scrappings |  |  |
Foreign exchange movement |  |  |
Impairments |  |  |
Depreciation for the year |  | 2,153 | 1,705
Balance at end of period |  | 15,382 | 13,229
Fixtures and fittings [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 234 |
Balance at end of period |  | 182 | 234
Fixtures and fittings [member] | Gross carrying amount [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 876 | 1,277
Additions** | [1] | 36 | 73
Disposals and scrappings |  |  | (502)
Reallocations between asset classes |  | 20 |
Foreign exchange movement |  | 11 | 28
Impairments |  |  |
Balance at end of period |  | 943 | 876
Fixtures and fittings [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 642 | 996
Disposals and scrappings |  |  | (502)
Foreign exchange movement |  | 4 | 22
Impairments |  |  | 20
Depreciation for the year |  | 115 | 106
Balance at end of period |  | 761 | 642
Motor vehicles [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 411 |
Balance at end of period |  | 306 | 411
Motor vehicles [member] | Gross carrying amount [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 2,255 | 2,069
Additions** | [1] | 72 | 230
Disposals and scrappings |  | (2) | (55)
Reallocations between asset classes |  |  |
Foreign exchange movement |  | 4 | 11
Impairments |  |  |
Balance at end of period |  | 2,329 | 2,255
Motor vehicles [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Statement Line Items [Line Items] |  |  |
Balance at beginning of period |  | 1,844 | 1,503
Disposals and scrappings |  |  | (8)
Foreign exchange movement |  | 1 | (3)
Impairments |  |  |
Depreciation for the year |  | 178 | 352
Balance at end of period |  | $ 2,023 | $ 1,844
[1] | Included in additions is an amount of $19,556 (2016: $17,731) relating to capital work in progress ("CWIP") and contains $155 (2016:$ 103) of borrowing costs capitalized from the term loan. As at year end $48,943 of CWIP was included in the closing balance (2016: $34,086).
[2] | Included in additions to mine development, infrastructure and other assets is an amount of $218 (2016: $557) relating to rehabilitation asset capitalised refer note 22.

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