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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, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Balance at beginning of period $ 82,078  
Additions ** 19,915 $ 20,949
Balance at end of period 97,427 82,078
Gross carrying amount [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 109,052 88,079
Additions ** [1] 19,915 20,949
Impairments (822) [2] (12)
Disposals and scrappings   (2)
Reallocations between asset classes
Foreign exchange movement (116) 38
Assets held for sale (214)  
Balance at end of period 127,815 109,052
Accumulated depreciation, amortisation and impairment [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 26,974 23,206
Impairments (614)  
Foreign exchange movement (43) 5
Balance at end of period 30,388 26,974
Depreciation for the year 4,071 3,763
Land and buildings [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 5,798  
Balance at end of period 5,928 5,798
Land and buildings [member] | Gross carrying amount [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 9,434 8,367
Additions ** [1]
Impairments [2]
Disposals and scrappings  
Reallocations between asset classes 1,068 1,051
Foreign exchange movement (23) 16
Assets held for sale (140)  
Balance at end of period 10,339 9,434
Land and buildings [member] | Accumulated depreciation, amortisation and impairment [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 3,636 2,950
Impairments  
Foreign exchange movement
Balance at end of period 4,411 3,636
Depreciation for the year 775 686
Mining assets [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 56,326  
Balance at end of period 68,688 56,326
Mining assets [member] | Gross carrying amount [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 61,498 45,078
Additions ** [1] 18,719 17,464 [3]
Impairments (60) [2]
Disposals and scrappings  
Reallocations between asset classes (5,525) (1,051)
Foreign exchange movement (49) 7
Assets held for sale (74)  
Balance at end of period 74,509 61,498
Mining assets [member] | Accumulated depreciation, amortisation and impairment [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 5,172 4,541
Impairments  
Foreign exchange movement
Balance at end of period 5,821 5,172
Depreciation for the year 649 631
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 6,967
Additions ** [1]
Impairments [2]
Disposals and scrappings  
Reallocations between asset classes
Foreign exchange movement
Assets held for sale  
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
Impairments  
Foreign exchange movement
Balance at end of period
Depreciation for the year
Machinery [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 12,499  
Balance at end of period 15,318 12,499
Machinery [member] | Gross carrying amount [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 27,881 24,536
Additions ** [1] 899 3,377
Impairments (529) [2] (12)
Disposals and scrappings  
Reallocations between asset classes 4,457 (20)
Foreign exchange movement (33)
Assets held for sale  
Balance at end of period 32,675 27,881
Machinery [member] | Accumulated depreciation, amortisation and impairment [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 15,382 13,229
Impairments (429)  
Foreign exchange movement
Balance at end of period 17,357 15,382
Depreciation for the year 2,404 2,153
Fixtures and fittings [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 182  
Balance at end of period 274 182
Fixtures and fittings [member] | Gross carrying amount [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 943 876
Additions ** [1] 202 36
Impairments (216) [2]
Disposals and scrappings  
Reallocations between asset classes 20
Foreign exchange movement (6) 11
Assets held for sale  
Balance at end of period 923 943
Fixtures and fittings [member] | Accumulated depreciation, amortisation and impairment [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 761 642
Impairments (170)  
Foreign exchange movement (41) 4
Balance at end of period 649 761
Depreciation for the year 99 115
Motor vehicles [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 306  
Balance at end of period 252 306
Motor vehicles [member] | Gross carrying amount [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 2,329 2,255
Additions ** [1] 95 72
Impairments (17) [2]
Disposals and scrappings   (2)
Reallocations between asset classes
Foreign exchange movement (5) 4
Assets held for sale  
Balance at end of period 2,402 2,329
Motor vehicles [member] | Accumulated depreciation, amortisation and impairment [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 2,023 1,844
Impairments (15)  
Foreign exchange movement (2) 1
Balance at end of period 2,150 2,023
Depreciation for the year $ 144 $ 178
[1] Included in additions is an amount of $19,323 (2017: $17,731) relating to capital work in progress ("CWIP") and contains $61 (2017:$ 103) of borrowing costs capitalised from the term loan. As at year end $ $62,624 of CWIP was included in the closing balance (2017: $34,086).
[2] Items of Property, plant and equipment were impaired during 2018 certain CWIP projects being cancelled and underground equipment that could not be verified.
[3] Included in additions to mine development, infrastructure and other assets is an amount of $161 (2017: $218) relating to rehabilitation asset capitalised, refer note 25.