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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.