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Note 18 - Property, Plant, and Equipment - Reconciliation of Changes in Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]    
Balance at beginning of period [1] $ 97,427  
Additions** 20,595 $ 19,915
Impairments***  
Initial recognition of right of use assets 146  
Disposals (165)  
Balance at end of period 113,651 97,427 [1]
Impairments  
Gross carrying amount [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 127,815 109,052
Additions** [2] 20,595 19,915
Impairments*** [3] (144) (822)
Assets held for sale   (214)
Reallocations between asset classes
Foreign exchange movement 18 (116)
Initial recognition of right of use assets 409  
Disposals (228)  
Balance at end of period 148,465 127,815
Impairments [3] (144) (822)
Accumulated depreciation, amortisation and impairment [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 30,388 26,974
Impairments***   (614)
Foreign exchange movement 11 (43)
Balance at end of period 34,814 30,388
Depreciation for the year 4,434 4,071
Impairments   (614)
Land and buildings [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 5,928  
Impairments***  
Initial recognition of right of use assets 146  
Disposals (149)  
Balance at end of period 5,420 5,928
Impairments  
Land and buildings [member] | Gross carrying amount [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 10,339 9,434
Additions** [2] 267
Impairments*** [3]
Assets held for sale   (140)
Reallocations between asset classes 25 1,068
Foreign exchange movement 5 (23)
Initial recognition of right of use assets 409  
Disposals (212)  
Balance at end of period 10,833 10,339
Impairments [3]
Land and buildings [member] | Accumulated depreciation, amortisation and impairment [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 4,411 3,636
Impairments***  
Foreign exchange movement
Balance at end of period 5,413 4,411
Depreciation for the year 1,005 775
Impairments  
Mining assets [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 68,688  
Impairments***  
Initial recognition of right of use assets  
Disposals  
Balance at end of period 84,217 68,688
Impairments  
Mining assets [member] | Gross carrying amount [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 74,509 61,498
Additions** [2] 19,020 18,719
Impairments*** [3] (60)
Assets held for sale   (74)
Reallocations between asset classes (2,989) (5,525)
Foreign exchange movement 2 (49)
Initial recognition of right of use assets  
Disposals  
Balance at end of period 90,542 74,509
Impairments [3] (60)
Mining assets [member] | Accumulated depreciation, amortisation and impairment [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 5,821 5,172
Impairments***  
Foreign exchange movement
Balance at end of period 6,325 5,821
Depreciation for the year 504 649
Impairments  
Tangible exploration and evaluation assets [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 6,967  
Impairments***  
Initial recognition of right of use assets  
Disposals  
Balance at end of period 7,139 6,967
Impairments  
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** [2] 172
Impairments*** [3]
Assets held for sale  
Reallocations between asset classes
Foreign exchange movement
Initial recognition of right of use assets  
Disposals  
Balance at end of period 7,139 6,967
Impairments [3]
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
Impairments  
Machinery [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 15,318  
Impairments***  
Initial recognition of right of use assets  
Disposals  
Balance at end of period 16,345 15,318
Impairments  
Machinery [member] | Gross carrying amount [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 32,675 27,881
Additions** [2] 897 899
Impairments*** [3] (144) (529)
Assets held for sale  
Reallocations between asset classes 2,964 4,457
Foreign exchange movement 3 (33)
Initial recognition of right of use assets  
Disposals  
Balance at end of period 36,395 32,675
Impairments [3] (144) (529)
Machinery [member] | Accumulated depreciation, amortisation and impairment [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 17,357 15,382
Impairments***   (429)
Foreign exchange movement
Balance at end of period 20,050 17,357
Depreciation for the year 2,693 2,404
Impairments   (429)
Fixtures and fittings [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 274  
Impairments***  
Initial recognition of right of use assets  
Disposals  
Balance at end of period 265 274
Impairments  
Fixtures and fittings [member] | Gross carrying amount [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 923 943
Additions** [2] 88 202
Impairments*** [3] (216)
Assets held for sale  
Reallocations between asset classes
Foreign exchange movement 7 (6)
Initial recognition of right of use assets  
Disposals  
Balance at end of period 1,018 923
Impairments [3] (216)
Fixtures and fittings [member] | Accumulated depreciation, amortisation and impairment [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 649 761
Impairments***   (170)
Foreign exchange movement 5 (41)
Balance at end of period 753 649
Depreciation for the year 99 99
Impairments   (170)
Motor vehicles [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 252  
Impairments***  
Initial recognition of right of use assets  
Disposals (16)  
Balance at end of period 265 252
Impairments  
Motor vehicles [member] | Gross carrying amount [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 2,402 2,329
Additions** [2] 151 95
Impairments*** [3] (17)
Assets held for sale  
Reallocations between asset classes
Foreign exchange movement 1 (5)
Initial recognition of right of use assets  
Disposals (16)  
Balance at end of period 2,538 2,402
Impairments [3] (17)
Motor vehicles [member] | Accumulated depreciation, amortisation and impairment [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 2,150 2,023
Impairments***   (15)
Foreign exchange movement 6 (2)
Balance at end of period 2,273 2,150
Depreciation for the year $ 133 144
Impairments   $ (15)
[1] The Group initially applied IFRS 16 on January 1, 2019, using the modified retrospective approach. Under this approach, comparative information is not restated. There was no cumulative effect of initially applying IFRS 16 to recognise in retained earnings at the date of initial application.
[2] Included in additions is an amount of $20,093 (2018: $19,323) relating to capital work in progress ("CWIP") and contains $165 (2018: $61) of borrowing costs capitalized from the term loan. As at year end $76,847 of CWIP was included in the closing balance (2018: $62,624).
[3] The auto-tap transformer was written off due to the large voltage fluctuations at Blanket Mine that caused it to burn out.