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Note 12 - Property, Plant, and Equipment - Reconciliation of Changes in Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Statement Line Items [Line Items]      
Balance at beginning of period $ 113,651    
Additions* 8,188   $ 20,595
Impairments (59) $ (144)  
Balance at end of period 119,410   113,651
Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 148,465 127,815 127,815
Initial recognition of right of use assets     409
Additions* [1] 8,188   20,595
Impairments (59)   (144)
Disposals     (228)
Reallocations between asset classes  
Foreign exchange movement (131)   18
Balance at end of period 156,463   148,465
Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Initial recognition of right of use assets     146
Impairments    
Foreign exchange movement (75)   11
Balance at January 1, 2019 34,814 30,388 30,388
Depreciation for the year 2,314   4,434
Disposals     (165)
Balance at December 31, 2019 37,053   34,814
Land and buildings [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 5,420    
Balance at end of period 5,453   5,420
Land and buildings [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 10,833 10,339 10,339
Initial recognition of right of use assets     409
Additions* [1]   267
Impairments  
Disposals     (212)
Reallocations between asset classes 556   25
Foreign exchange movement (37)   5
Balance at end of period 11,352   10,833
Land and buildings [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Initial recognition of right of use assets     146
Impairments    
Foreign exchange movement (21)  
Balance at January 1, 2019 5,413 4,411 4,411
Depreciation for the year 507   1,005
Disposals     (149)
Balance at December 31, 2019 5,899   5,413
Mining assets [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 84,217    
Balance at end of period 89,869   84,217
Mining assets [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 90,542 74,509 74,509
Initial recognition of right of use assets    
Additions* [1] 6,633   19,020
Impairments  
Disposals    
Reallocations between asset classes (687)   (2,989)
Foreign exchange movement   2
Balance at end of period 96,488   90,542
Mining assets [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Initial recognition of right of use assets    
Impairments    
Foreign exchange movement  
Balance at January 1, 2019 6,325 5,821 5,821
Depreciation for the year 294   504
Disposals    
Balance at December 31, 2019 6,619   6,325
Tangible exploration and evaluation assets [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 7,139    
Balance at end of period 7,201   7,139
Tangible exploration and evaluation assets [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 7,139 6,967 6,967
Initial recognition of right of use assets    
Additions* [1] 62   172
Impairments  
Disposals    
Reallocations between asset classes  
Foreign exchange movement  
Balance at end of period 7,201   7,139
Tangible exploration and evaluation assets [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Initial recognition of right of use assets    
Impairments    
Foreign exchange movement  
Balance at January 1, 2019
Depreciation for the year  
Disposals    
Balance at December 31, 2019  
Machinery [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 16,345    
Balance at end of period 16,307   16,345
Machinery [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 36,395 32,675 32,675
Initial recognition of right of use assets    
Additions* [1] 1,314   897
Impairments (59)   (144)
Disposals    
Reallocations between asset classes 131   2,964
Foreign exchange movement (28)   3
Balance at end of period 37,753   36,395
Machinery [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Initial recognition of right of use assets    
Impairments    
Foreign exchange movement  
Balance at January 1, 2019 20,050 17,357 17,357
Depreciation for the year 1,396   2,693
Disposals    
Balance at December 31, 2019 21,446   20,050
Fixtures and fittings [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 265    
Balance at end of period 258   265
Fixtures and fittings [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 1,018 923 923
Initial recognition of right of use assets    
Additions* [1] 46   88
Impairments  
Disposals    
Reallocations between asset classes  
Foreign exchange movement (59)   7
Balance at end of period 1,005   1,018
Fixtures and fittings [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Initial recognition of right of use assets    
Impairments    
Foreign exchange movement (52)   5
Balance at January 1, 2019 753 649 649
Depreciation for the year 46   99
Disposals    
Balance at December 31, 2019 747   753
Motor vehicles [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 265    
Balance at end of period 322   265
Motor vehicles [member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Balance at beginning of period 2,538 2,402 2,402
Initial recognition of right of use assets    
Additions* [1] 133   151
Impairments  
Disposals     (16)
Reallocations between asset classes  
Foreign exchange movement (7)   1
Balance at end of period 2,664   2,538
Motor vehicles [member] | Accumulated depreciation, amortisation and impairment [member]      
Statement Line Items [Line Items]      
Initial recognition of right of use assets    
Impairments    
Foreign exchange movement (2)   6
Balance at January 1, 2019 2,273 $ 2,150 2,150
Depreciation for the year 71   133
Disposals     (16)
Balance at December 31, 2019 $ 2,342   $ 2,273
[1] Included in additions is an amount of $6,476 (December 31, 2019: $20,093) relating to capital work in progress ("CWIP") and contains $26 (December 31, 2019: $165) of borrowing costs capitalised from the term loan. As at period end $83,323 of CWIP was included in the cost closing balance (December 31, 2019: $76,847).